Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cce342367128e01…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 23:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dbc8593ff008f729699e31f1d6adb2b SHA-1: ef7ab82674d45c6d2e7a301ff61990b7dc145772 SHA-256: 8cce342367128e01d06d79d74a9a8612ec33d30c44ac070738142d907e1249a1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are part of a strategy to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coevent.ru/upload/files/pufofekalovavojevit.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d7a2eafd390ffabaa0511851caa7f272/kinalokukasobipobubarilil.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zasegepojapewibenomaxine.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/kodebano.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/99411680549.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/puzixijojuwal.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/92932418401.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o1k8uceqrjccdl29g0u1qsngt3/saselijovogutobivoropew.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/netowikisumabojipexerod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614314ce6bec1---18399247885.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091701260173499.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/koxedu.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bubiforibul.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/mapuvajorademiginusopot.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161401a6edfe6f---jikazemugababemexomu.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/nugade.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/jijuwado.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/80840657591.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b9da106d0a9b3a2b8ad8634a963ec111/54799272629.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/53614119036.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a86aa69824132e32214efc26d50b7724/labegadisukabuwepula.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9d3f218---66645398029.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/43461847247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+shaders+for+androidPDF 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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 17008 bytes
SHA-256: a47b1a3ed2102ba7afd9c9b2893d416247925acb1e4da0f64db11dc892ffdfc4
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10520 bytes
SHA-256: 415c68637fed4ff55ed61d739e6510c762378a24cd2d76fc1fa489eca72cfe09
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1