Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03048327ea68e95…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 14:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f327e745cceaa7e82a571f85c204576a SHA-1: d6b80dc65454ba387cffb15104d498f34a7a5774 SHA-256: a03048327ea68e958fc09aefb4855e58abd3c726a1f3ed4565bc45087c6a73c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, a common technique used to redirect users to malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://villapellegrino.it/userfiles/files/wamukes.pdf In PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/76896580783.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/bowusexatowovamibo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffee48e357---18829489830.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/loterugudikomurijexijumu.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/22564982546.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa84bcafb6---15052925205.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613243ad1a8ca---1851055363.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/39910922743.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/54103868271.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/natujisifigilidisaseg.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/xolizide.pdfIn PDF document text
    • http://w-mill.jp/images/file/15355965899.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/74782118441.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/11428512740.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3b966b455f795ea62a537b5a08ff3aba/zoxowelibezukewepikemogu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/83nulpip9hugucacuu44kt9ooc/menofe.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/50283566762.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/jorakebugiwonejirujiw.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/61570694373.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/80290160994.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/wevaziz.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/kafofatifinorobujurezaro.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/sodupidijakatirejukenotok.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/86392440183.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/4686303018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=xbox+game+pass+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 10496 bytes
SHA-256: 795b6e099ebb8a2ffce9e2bb91f50d7b5da31aaf90f3aa6c5707a9abfaae51aa
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 17536 bytes
SHA-256: f1c45d56dae1825f8e0868c6099fcfc87adacb8e002ca029550d26d2d988324d
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1