Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef703d175290d79d…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 19:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8995d106e3f04376595e518dd50a1215 SHA-1: 1ee3a32176c34c39e614745ef8424b92c32ad028 SHA-256: ef703d175290d79d2181b52f44d9ba5b0849119022c27fc038ce33d589f6d1ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/89481d9283893fa2e6252caf0a42df83/86663861948.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/plmjipca2ck6m8hbs2b2oeil5d/tosutexowirofuku.pdf
    • https://aslimitada.com/userfiles/file/99297427427.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/810d0b0713152d812d4ac99dc05c288f/34843964536.pdf
    • http://upbfassadenbau.com/upload/file/legakovomime.pdf
    • http://energo-winstal.pl/userfiles/file/sutijopuxu.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6c134f845e07e88b6a38b8b86ffcb7b1/168719416.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qkice7lpdjlb2vgdb4o8l351nc/90023820222.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4106fa08---wewupunilobolizabavad.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/bfcc4c42b5c57fa45633fd58eeb775a9/rulik.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72937f564d58f0b9373bb1120225990d/ziweloxo.pdf
    • https://akapacha.com/userfiles/file/fotoxax.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/53f368233e9409f3ef0b25ae43859a02/getuligi.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/labueps4fajmbdq6a5qr3olap1/daxosojotawajonugemu.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519153636567242.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c6p81afo5v7u6l9lcmtkqu9ieh/46714755482.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa3a66ef2---lopetu.pdf
    • http://aarogyamedico.com/userfiles/file/temusedojaleva.pdf
    • http://petra-dario.info/upload/datoteke/rimetidopexebomafo.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca0b7806e---48148364714.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5567d732fd---sejotowixukuvuvaral.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/mefagebuneduzare.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acetic+orcein+stain
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e163.bin
79d9dccc423668f843d4d3979e54b8cf19742d91494f27235b26c0440bb82962
pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10160 bytes
font_01_sfnt_off0000f850.bin
0521f10058aa63df1fd1c2e22523c5b3fea2e4124c19ca278cce3687ec676161
pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 19372 bytes
font_02_sfnt_off00012ac6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 16792 bytes