Malicious PDF — malware analysis report

Static analysis result for SHA-256 1578529a77074c09…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 07:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dc129aaac3d0f17d6542f43a8861ab0 SHA-1: 645cfdb2af981782111ef9c375439e4f4c43f811 SHA-256: 1578529a77074c0904c5e0d2f8cb3de659216554f0c034edf67b183753ab25e8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links suggests a phishing or redirection attempt.

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/q033b1kk3b62j9u743mov86cpl/fogug.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/a5bf7f53fb040189f456a8bd991ca044/15054671864.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095965f42585---97255715740.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/fa3be97a0db677e8483cb5e9ce83c152/loxuvolirupigabimadigaxir.pdf
    • http://naturalmis.com/userfiles/file/saxuvimidixajor.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3c94a4d5---3515016197.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9e86ba14c801ef50d2385653fc72bbdd/45596150984.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf95bfa27---86778825989.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc38499c2be085246745916e7d39266b/kikadalulimarowej.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609992e74bb89---vofifeses.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/359fe64dd48d08040603fad236bf51a2/xazogadisilabizotaxokezen.pdf
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/voxuganoxisavoxagovi.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/t1bi6h20lrlqhg1ojcafpnqncg/10306091512.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fcf8338a8---sewoguxoseleniwap.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00a2e3ff9---83227070642.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d247fde7275---ganovovurotuna.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7kmkpc6v79frugjs5dua1c95io/rokawowimaxesagomoreme.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a530404829---vaxuwuwomopeb.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609133bee10cd---liratogijafuzug.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s6jc7ipikqkoaoedq0kpuf8lq4/63094210645.pdf
    • http://naturallabs.de/userfiles/file/zazugezizixo.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2e7316a9579577872581e1dfd111215c/manazezonibuto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=new+president+and+vice+president
    • 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_off0000f46d.bin
42cac2a5a5bbe44a5fad6b54c93e58a5ff32dd9b45bd2503d55409559db96638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 17068 bytes
font_01_sfnt_off0001210f.bin
36840ed054d4eec8ae89ece897ce51e8190cf560fb5870fe0949ed7bf0d2474e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10468 bytes
font_02_sfnt_off00013912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes

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