Malicious PDF — malware analysis report

Static analysis result for SHA-256 845998ac9d8a96f8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 15:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 352636f9d68af3e57dd6146917865c5c SHA-1: 49d11a74dd567237a7d25cf8758c90865b0a6f4b SHA-256: 845998ac9d8a96f8e0cb787485d9a65a5e97c94953e793f2c79cfce060e61346
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'callback phishing phone lure' heuristic suggests a potential for social engineering, possibly to trick users into revealing sensitive information or making fraudulent payments. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=fundamentals+of+management+stephen+robbins+pdf PDF link annotation
    • http://craftland.de/res/wysiwyg/file/44890656136.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/40966536989.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/58168110021.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109031021533554.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/nizadomukesobeviben.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210902012703.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/21035352520.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/50509876443.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dixiboxenaxezitefudi.pdfIn PDF document text
    • https://ms01bet.net/contents/files/95038826345.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/66849169565.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1e47fd27---42952073551.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/wizisekibozezasatinal.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/rumek.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c46e4393---78460374958.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137808d8e197---62718514452.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/94411710109.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3a2ce489f62ead59d10d0e29640cd953/78300558738.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/lilusepesafopej.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/33249757431.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/59685846180.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/40386708086.pdfIn PDF document text
    • https://soechi.net/userfiles/file/16123551872.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 11164 bytes
SHA-256: 28141129acf89018d2ef2b5fd046734bbfeed674297a7a91da0357b2b296cde3
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16728 bytes
SHA-256: a0bc24f459ca3cc9b9211912fa2049d7ab8eba75682292ca96b95bd7c9042e44
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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