Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2dba61d92d0a91…

MALICIOUS

PDF

89.0 KB Created: 2021-07-18 17:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4d06a4fe948bb924dcb6a265ba55550 SHA-1: 1706687fcb812b564431e1b5efdca6665e81616d SHA-256: 0f2dba61d92d0a91f5349cc8afca12575994e83adc5378262a99db8b53d05258
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This indicates an attempt to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742be470865---pozepimesoxo.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4e2c4441---nakijodapurowupuvig.pdf
    • https://vieclamkinhdoanh247.com/upload/files/2057902547.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/bebudusiz.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bce095702f0edf4fb9b714d568b888ac/ximozakuzedetit.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8b0d6f959---32559461265.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c5316910bea5087cea06e2c4b153bd4c/49434980440.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/78368084321.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/cec91365eec18b42f6d6d2d190b9830b/nugulevobepanejataxo.pdf
    • http://musicpark-live.de/userfiles/file/11914966607.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8031987876---35713811013.pdf
    • http://bioscipublisher.com/files/upfiles/file/kudiletiweje.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4be5a8bf---zuwimizaponutagovegu.pdf
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/39946912336.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160946995a68e7---39747098212.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504151008403620.pdf
    • http://legalinet.eu/userfiles/files/92243482012.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160703e12927a8---pabininigulifozufodi.pdf
    • https://alexandrapanayotou.com/web/images/static/file/63318944578.pdf
    • http://sincaremedicaltour.com/js/upload/52136557672.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d27e8361bff16fcd9a28ec11bcada901/29572251717.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cfb002546613201e306738d706bc2248/lirokuruge.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bdfd812c---19929768119.pdf
    • http://hydrem.ru/images/file/xapobugowimofasexixevo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=whistle+for+willie+lesson+plan
    • 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_off0000fb5e.bin
e4f35994d0dc357830bb970e959b79df012cdca90b877409ab8639e095f10cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10536 bytes
font_01_sfnt_off00011360.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
font_02_sfnt_off00012b72.bin
c78a475ca3d9a0fb902fa5097c26401f092ba5d378de65d83d62efef380a9340
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 16692 bytes