Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eb353c2524d7be…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 20:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efaa2edf3edd0206407b8ef2dd6e5db1 SHA-1: 9f8ef125694780251d767ce64434e9a7298e736a SHA-256: 87eb353c2524d7be549eb606433848f4e47a563427c3d2330861fa4cbab75471
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://achilleferolla.it/userfiles/files/vofewidurinilalizi.pdf
    • https://lomasdelaweb.com/userfiles/2008.09/file/fudup.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/86886215823.pdf
    • http://soldearenales.com/galeria/files/talovuvifesofatijivi.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/31706007931.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/15137467909.pdf
    • http://telesson.net/_UploadFile/Images/file/parijurutorobikilo.pdf
    • https://aczv.fr/userfiles/file/jufiwitudir.pdf
    • http://tunglamgarden.com/images/fck/file/tevirasavelugixikur.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/53453514195.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/09r31qs21580t7nfa4ie4gacbj/kavomefowovubinetoge.pdf
    • https://guptajimarriagebureau.com/userfiles/file/nifipesetuzobepose.pdf
    • https://hattoco.vn/images/ckeditor/files/geguxa.pdf
    • http://proficlim.ru/public/userfiles/file/leragoxuvitoget.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/74375097115.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfaa28fa3---vigupijedasutixewolam.pdf
    • https://tarsiman.ee/files/file/53000247119.pdf
    • http://saothienemb.com/uploads/images/files/wiretagojixuwusatunaguruj.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6e2fc448e1aeff1727e6a2aa228048dc/xufilijalelisulovemarufu.pdf
    • http://china-baby-clothes.com/d/files/zerofokana.pdf
    • http://plechotice.sk/tmp/file/63237399265.pdf
    • https://uangraja.com/contents/files/rigajobo.pdf
    • http://marthomaiticherukole.com/userfiles/file/16501924854.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+great+gatsby+novel+download
    • 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_off0000b379.bin
b1136a5bb43cf5bfed1ed5f6295a092305d1c016cd936120bb57608c7ddda3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB379 10804 bytes
font_01_sfnt_off0000cc36.bin
9b06b201ff5db89b3c77b6a6d914a1c1c3543dc41ee558fd3531d4863dca0a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 16648 bytes
font_02_sfnt_off0000f71d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 16792 bytes

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