Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c9c584dd3432ed…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 20:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbaa27a767024c5d1e9b3ce312f53018 SHA-1: 037a8df28b546d20be62b19ca021a26007f3aa01 SHA-256: 38c9c584dd3432edb5d78d75301beb86b5d772be3a35be2233d400a974c63360
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_RANDOM_URL_LINK' specifically highlights a link to a suspicious PDF, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://oniceh.ru/uplcv?utm_term=transfer+all+apps+to+new+phone+android PDF link annotation
    • https://dcimx.com/files/liguk.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///mojiganomoradego.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dfa61280---fikorukapak.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8da2e77beccff8a2ae2d33d1e18e7d07/wipovopodare.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b1dfacaac48c459a657697c0a78f7b1e/suketunigodup.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/75498190678.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/84291682237.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/terexefowekug.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jemanekoxivikapotabo.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wexos.pdfIn PDF document text
    • http://telektrans.hu/editor_up/77812993123.pdfIn PDF document text
    • http://goref.ru/files/file/78123742749.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/67237491164.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/zuxukapozixaxurozosenilar.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/lojoz.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/vozupokumijosijakagorox.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jumudazomoxeb.pdfIn PDF document text
    • http://megalaserasia.com/upload///didupabiwabogetijimafegi.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/81737830342.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/jekasizinij.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/38296861053.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/89836223431.pdfIn PDF document text
    • 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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 17848 bytes
SHA-256: 59f0aa45c6b8125d738feabf68256074f61b4055381bddd216e1cc1c70191ab1
font_01_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 10644 bytes
SHA-256: 8a8d0c6fe2b9349db728369c4b180a6f9c61abe7de8c9f48330d70d382c1fb68

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