Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8197c5993af7ee…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 13:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 716a25788fe9eaa3d1d014295c2a729e SHA-1: 5d2db0867a2355aff285b4ee06a9fc0f39746537 SHA-256: 2b8197c5993af7ee85814e905f8593a91642aabf1c17013e9a824717e798b202
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document's structure suggests it is part of a link farm hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of a 'password-protected archive lure' heuristic strongly suggests the document is intended to deceive users into believing they are downloading a legitimate file that requires a password, which is a common tactic to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=pokemon+psp+android PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613280c800d43---1976225755.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/051d52952bc5db87f41d727955156057/jedakepe.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/7039784526.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/sodobivarefutunedok.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tuziguwuli.pdfIn PDF document text
    • https://anjingliar.com/contents/files/xinodotitobikisew.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/56224558714.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/31412284178.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613580d950967---ratotinakimizutevidukojaz.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/nizibinisepovesok.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c139fbcbd277ec24a5813bd7abf1cf7f/xivofavumebodotozomedik.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/91067602997.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/98521102732.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/45924405579.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/4965273529.pdfIn PDF document text
    • http://runhouchem.com/upload/files/20795724267.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5q10gs8ditusfgo2s1jv3qnpia/fivifuz.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/85494595730.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/k8i8579b5me28uogten8lf8mt1/sujosiregit.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/36438137255.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/lixaroru.pdfIn PDF document text
    • 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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10504 bytes
SHA-256: bf08490fd937dfd4b2a12727d261970a699ffc0b6f608d47f0686717fe1dbec5
font_01_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 18956 bytes
SHA-256: da4ca1ec8515ab64333c55b2a7fff135ca3ff2ce77b59a67aceb42fb28efe614

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