Malicious PDF — malware analysis report

Static analysis result for SHA-256 0628119bed38a426…

MALICIOUS

PDF

102.4 KB Created: 2021-07-22 06:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 35ddc927a02a65cb78965d14d91511b2 SHA-1: 18e78caf28596c7dbf2a4ea70f316edba0b568c9 SHA-256: 0628119bed38a426ba96a2ca4f22951579e3bb880cb6dd7fa653a129359e57e3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'Recovery secret / private key request' lure, indicating a phishing attempt to steal sensitive user credentials. The document also hosts numerous links pointing to compromised WordPress upload directories, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d509d76023---82255865981.pdf In PDF document text
    • https://szabobuszrendeles.hu/files/files/86444765401.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ronomomojadifawaxoso.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/tapuvepetadat.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2e86esnj1lafu1tklna6ar0lc3/newexabimigabu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4dece5c427f258b011b50290b11cb86e/4379224872.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/44594334919.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b9898861---gibokawelalegozusasoni.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/35d83485d3591c4547aa06b2f05b06b1/71772549366.pdfIn PDF document text
    • http://progetec.org/userfiles/files/37184262678.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb44a0d5cc---69818067319.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/befujoti.pdfIn PDF document text
    • http://nensi.si/upload/file/42184971127.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/61140040898.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/46569118732.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788705177c6---madukeme.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d9babe10990ab190497d68c3abd2f4af/nanikituvab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3628581622---xewerekikawaz.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5e0a152241cdbe1c2ff7ea18882a808e/kinaxapoviramenemavowefu.pdfIn PDF document text
    • https://kopari.hu/files/file/folakaxigefotomatoliwev.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/burd9hdc3iucjd4ilqkjt9aeim/bitagawefifuribezisiza.pdfIn PDF document text
    • http://tipiland.net/upload/file/tufilokivamim.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7cbfa39dacaeac538a6914ca381ffff1/kejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=example+of+eavesdroppingPDF 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_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 10896 bytes
SHA-256: ffcb538a0fed5dbc810f044cc37148dee760caf191b5dc26cc82933419df6543
font_01_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCE 17596 bytes
SHA-256: ccd8156c9d2fe50648ef920b5a17f8c69fc781561f369d1ac9245c9c0470d588