Malicious PDF — malware analysis report

Static analysis result for SHA-256 7283ee8abe4e37b1…

MALICIOUS

PDF

92.8 KB Created: 2021-08-26 17:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f05c0d8170e0733dad855c7f2d9110a SHA-1: 942f30fb36484e2ec235b562bf903ec8f4ff91da SHA-256: 7283ee8abe4e37b132df227737933be52a7f69e28c0f8a6d42a1b21b30f5bf93
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. The heuristics point to the document being used as a lure for credential harvesting, potentially involving MFA abuse or callback phishing schemes. Numerous embedded URLs link to compromised CMS uploads and disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/jorofedikolabideso.pdf In PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f762540fde1---81873631081.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pojilumupinidor.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/bunerewopati.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/30513729250.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bd043719839474ca45a95fa9c0c89d3f/947870089.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/34590557131.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/nevefe.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/pegosopa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3b445v8ihh9g1ip9hgu32h8ps1/sesaxulegekokamaj.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/bomigogafusak.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77bd90c3b---tajewogoxaketaku.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/gawozomuna.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908ce7a9e1---3182950204.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/22178184021.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210806021214_zmfzh4.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/geve0imr6dbi5jqnhq61dgj562/54730823946.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/16626913595.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/xitetajubak.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jt3aqj61f082qmv9pst4rej4i3/dezazavowiluk.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/nuxexumetadaxuritinu.pdfIn PDF document text
    • http://stevis.cz/files/file/4030584835.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec5b5f867---7022989980.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e550644e---54752287224.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/badumaxomumupefirepufagi.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/latonifufus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+active+credit+card+numbersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10648 bytes
SHA-256: acbef062acb852f0483656e209107e564befcc5e26466e44ca1c290b2448c1be
font_01_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 19312 bytes
SHA-256: cf3c57df31b003626d3569a95958718fefc01981b4e7d8492187b20745e4957f

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