Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a591a59736dd435…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 18:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c4a6c010586158c8b4e2335e0551775 SHA-1: 7e750a64bd42c0a626d8d6aa8b932548463efdc4 SHA-256: 3a591a59736dd43523f4825a3dd6a92637d99770b31b7fbd61f106f85b2336e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive the user into initiating contact, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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://tinhdauvietnam.vn/upload/files/jesaxadexa.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7898c45d---40522820552.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/86501310742.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/74276054378.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kidefavidelomikibebivil.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wogosu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pusajawowegufu.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f69e0900743a1ae1fa8a74fee5d1ff80/27875366735.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf757d6fd---301128798.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/suwulukefu.pdfIn PDF document text
    • http://skene.es/userfiles/file/56478300095.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/74680907396.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/46424471018.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/64603862399.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///vumifojesewedesisijadulud.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/29560583593.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/595f52107c1a854bf2f142b05c67d7ee/95304526660.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b9caac836b3bdccb5146af17ceca699d/80831643175.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/kapewiranibuki.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/91502842840.pdfIn PDF document text
    • http://www.520amis.com/upload/files/78682955770.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/63076859110.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a30e0c8203---fugazokonasufa.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/nabubowifovexij.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/9139016674.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/37913997139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lingayen+postal+codePDF 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_off0000c24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 19208 bytes
SHA-256: 618c85cf5b8f51409aed64ac547ce20d800a1485834f00f576a2422422ba4a6c
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10660 bytes
SHA-256: cb03285daf4c2f69622b54737b9d21b49b75b01a84cd5db0eb068aed077c1ed7

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