Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b2a3d19f668f03…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 09:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27e30053410999ba53d820014aa68cd7 SHA-1: 694009c9a5dad57c6324173b485e10f92d355077 SHA-256: 38b2a3d19f668f03482780c0d687b8dd9fa91ba9176c92d1318a99a2a60324a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites hosting PDF files, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly indicate malicious content, likely for phishing or malware distribution. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage potentially vulnerable web infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bb4c906f89ee47f470a6fbd7dfdee12d/87891176921.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/retewutigafowisefag.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f06a6d2---xumigi.pdf
    • http://bellsazshihtzu.com/clients/878694/File/finofarupofomum.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a78c0bd23704bbcef8c7eb10ce5573c1/funuzajefaxalizivino.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba618f405---saserufenizetimevokuwub.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ff4545e559050893a5a2c8db03c57f40/86039370131.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c4be7a7b25dfe529da4c4757bff8f21a/55218692453.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc88048b8---dedizibadexebodawomuf.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/jomasafixe.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/15249334668.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506233834366329.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d6670d20---32550519757.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f757abdff---xakawemerowisudebawor.pdf
    • http://beepost.vn/upload/userfiles/files/14225541146.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c871deb3f6f---18151743522.pdf
    • https://pacpartner.net/images_client//imagesfile/wasugi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7ef0f460dd4e8c03074156d87431e12d/49582927491.pdf
    • http://vietthanhstone.com/images/news/file/tumemunanemorusosifo.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/76732146450.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091155631ee1---varugafi.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/1iagtjq3ff8lfi3df16e63ii2j/78589543193.pdf
    • https://mimpiindah1.com/contents//files/janizafomejusemisubake.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/nevalulizavugerejamet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=give+up+robot+2+unblocked
    • 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_off0000ebc0.bin
d57fa1073aa2e2b760da38be10205bc89e0ed34d00411c6646cf7bb1a83ebf0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 16948 bytes
font_01_sfnt_off00011817.bin
294eaa06ec9e423e7abd11a2a006d6046441cdef7194e3598e8523e3168d281b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 10736 bytes
font_02_sfnt_off000130b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 16792 bytes

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