Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d97fc90bcaf7d4…

MALICIOUS

PDF

170.1 KB Created: 2021-07-04 21:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5586dc3841a30b3246aad13d1bf9139 SHA-1: 0622fb5b40173016d125cefec5d86025d3cb5c3e SHA-256: 61d97fc90bcaf7d412b1eb413e5d38a4ebdc2fb22808c75c0489cc4efe0f6d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. One notable URL is allytemp.ru, which appears to be used for redirecting users, potentially to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://allytemp.ru/uplcv?utm_term=blue+pelican+math+calculus+answers
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872ba4e2f75---taxajuraripez.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/it50sd925l370ns3dc1j2ehfcu/niwaxuf.pdf
    • http://vieclamketoan365.com/upload/files/tisisizigixu.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/gumujigijerubowoma.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc44ceb66---556431255.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/89g3i2u1vt6k8rgrupmskpdql7/sanejazetidofu.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/664d4b386fb94f227ce221af6bb57262/329750301.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/tixalevuvan.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jnfspmcfim4b93kolg1ugatlfc/bezofewoni.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c7f38569e6125ce385f36f7dc376fc98/70919643838.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31d84d55---20876281461.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c038c294d7---47825360019.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/465de66de8af83401ad3620b5e408200/zuvitoge.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fb6dbdf6---28760597578.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b0ac1c57---namep.pdf
    • http://dieta-plus.pl/userfiles/file/feveg.pdf
    • http://tycoonmedical.com/userfiles/file/87206611990.pdf
    • https://nikosdimos.gr/userfiles/file/gejigewamupevemino.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d7627ff438f919f3b120e452c1a5d43c/memiwoxefovukumeroj.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pabonokebuzibuzazo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609274d7e707b---moxivebe.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/5jjvajjr20jtg2gucamiccarg7/zemulujowebo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746169256ef---gobironopilezivez.pdf
    • http://indecomavo.pl/inc/98749710522.pdf
    • 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_off0002321a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2321A 16792 bytes
font_01_sfnt_off00024a2c.bin
4e734cc5db399f6512e7f00d602fa72141b246b827c8fd1efcff0a0874d21663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24A2C 22608 bytes
font_02_sfnt_off000281d7.bin
54966a26bda2f0a799cc7d0d9ed6f47e4e7a02570f79d5cb51a1467ec8564a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x281D7 10756 bytes

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