Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacc0a14e3863c7f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 09:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cc8bad9a67d887a5daf1daaf9bda62d SHA-1: 994c5fa35f5a15ed947377220411064a8114137b SHA-256: eacc0a14e3863c7f63abd33be07b3d2ede1c1c0df9a1f38ba4718639429a74cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2u60ro8vlt6pdjacdkprnd9rv3/15025870013.pdf In PDF document text
    • http://nature-revive.org/files/file/redozoxixovujafojonal.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/13035853437.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/33d90de326d2646383e3949564a6b94a/wakuf.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/33262834430.pdfIn PDF document text
    • https://shibbirs.com/media/files/18695534357.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/kobariduvimebexumevazik.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/bedamikisetekorom.pdfIn PDF document text
    • http://masonhn.com/d/files/wojifafebipuxudizix.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c241de1459a---pakefonaguzubadifa.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/63684807331.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92529597471.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a300049a1---60708474152.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/33185610577.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a146e1f3cbbeeed151dff34e73a406b3/17469488082.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/5175142263.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2b61cb4de---78006691431.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7680042218.pdfIn PDF document text
    • http://aweibel.com/Photo/file/gunumil.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/denibonadovuxigadafedig.pdfIn PDF document text
    • https://highrise.pl/file/womojomojukubakijagojasot.pdfIn PDF document text
    • http://farmina.ru/uploads/files/katitaminok.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/wawufejakukifas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=thick+mucus+stuck+in+back+of+nose+and+throatPDF 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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 17140 bytes
SHA-256: 58e332777e2c0f183315f61b50f3458b773fa4c91fbfa7076839bd16748ca816
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 10988 bytes
SHA-256: 5c2317bcc63ce4cc66bea1cb19716530d2291f0a5825984b99cd251c9302cce0

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