Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61e6d846b943d2c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 08:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82436104740f969a57f81d05aea4decc SHA-1: 5565542955d8cabf059b57c22dc4cd9333f1af34 SHA-256: f61e6d846b943d2c9ab7afdb98daa7f3965e0c07f361ca34905e4fb99b1715df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The presence of multiple links on compromised CMS upload storage and disposable hosting further supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/sejomezowewabizesel.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/dojezagakofos.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/989f2cf0222e28ecc1ca2a4a7f55c3fd/28760174488.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ebb8bc49cc405f835e218cbc9a4bed38/kevebidaxanalatewibenegud.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/972711203b14baa18b53bf4d2db71c05/31038169418.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/917a65fc3e58b10957a1177d2e1ccaa1/wupazinu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d9d96fd8---jabijevopaw.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/eb5bead5e906c35390fef3afb2897d69/wuguse.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g6lforlcri7qtdk1p134c61kka/99654051032.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25ab2f21afa5042862d87ea18b5e867a/judovijoxukivufujokuw.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/wifexepiruxamupolijejes.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/84298851612.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c270954076bb6e7c53a6a6f34ae7180b/nawatoriludufuvul.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3d19797f15926291d98725446fd97ffe/28008190645.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabc2b37d29---54236629083.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/se7dicl1fn0flt48cgd6avd242/98623232833.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1629040656.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/74704409801.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/64508547801.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd9def526---72610955791.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822d46b4b7---raniwonosoposo.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/vafurazuniwazawawavaneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=working+memory+and+second+language+learningPDF 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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 18148 bytes
SHA-256: b13191b527b4b7735c40325a6d471c52914e0b569c255e0b12137214a07bc5c7
font_01_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 10916 bytes
SHA-256: 136e935dd032e6cdd8a1c05a3d8616ec93d3b55435c0fbd6e0ec603918b9aec6

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