Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dac178b1567f267…

MALICIOUS

PDF

92.2 KB Created: 2021-08-01 06:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf33091a5217524bfd01e092602678c2 SHA-1: d949916a12cafd219db941d52126b009852e7c4a SHA-256: 5dac178b1567f2675e15fd3469667381fed82285839c56a7163147571fb8860a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, consistent with an advance-fee scam lure. The document's purpose is to trick users into clicking these links, likely to download further malicious content or lead them to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://detectiveoffice.net/userfiles/file/84594579175.pdf In PDF document text
    • https://grnca.org/img/files/files/xozetobu.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/wizevasazotuzoririlo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/jobakaso.pdfIn PDF document text
    • http://clingac.es/d/files/15218572798.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2670beaf---15354614042.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wubusolijokavav.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ih1lb7nr5rrmr5jnlrovnkt7f4/3741152502.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/49980902537.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wasububusavaf.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/80054921131.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3e2ca42b---43785125330.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210730000607.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8f5ead7bd---jigav.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/modudexigubowomiloxeburam.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210728032229.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e7ecb3887---35705014542.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cffaad05acec5fcd0e3fd0266cc54d9b/12130818001.pdfIn PDF document text
    • https://kawanmto.net/contents//files/93620591126.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sebimufobobetutukixuveni.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3babf821---24367663448.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38fa4d26a---dunilujop.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/gogamevom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+app+to+play+game+and+earn+moneyPDF 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_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 17624 bytes
SHA-256: 48d893b86d28e3b6ddb5c306f8536e0d9b2cd6cb09a54c7b8ac9fcdb596298af
font_02_sfnt_off000149bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BF 10812 bytes
SHA-256: 2c8d778eb8610471d88d079565715da3ac5b5f19793fdcc7a9127103a51a9acb