Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4055bb704462dc…

MALICIOUS

PDF

73.1 KB Created: 2021-06-18 23:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f122785cce0cae4b9f646431daf0fd35 SHA-1: 3889bdea92c51fd44ffd93f51dd3653a72010496 SHA-256: 8f4055bb704462dcc0fc76d94e08233a0ed441226562969de81e7207e6a4e2c0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware-hosting pages. The presence of 'utm_term' parameters in some URLs further supports a campaign-like distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=sims+4+snow+white+dress
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e396fc7d48---88926036157.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45481743e---69820128253.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68712ce0a---43453517931.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da5f6509e---tonutasemibisidigu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd73e9c78---6217336524.pdf
    • https://penal-garazh.ru/files/58910654930.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac430a8f1ad---83953954691.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887ee984b1---zomazuwipifuma.pdf
    • http://3qbuy.com/CKEdit/upload/files/35880351445.pdf
    • http://accessiblevehicleservices.com/userfiles/file/dozefebaraletixefudunuz.pdf
    • http://www.kickcommerce.com/userfiles/file/votutota.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eb05ff55c0223ff19180f079c32a6096/25884916713.pdf
    • https://kermoulin.com/userfiles/file/ginoguzoruwenulopo.pdf
    • http://ck-kutnahora.cz/gais/image/file/fatisezakefugikezatososub.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c295d83f48818e3a236f7156782b9746/dusojojukager.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/05o0jnc2vh75ifqsgo3l92rdp2/nefapizageda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000cbb4.bin
34f70a35693d4efb06dd57648c87a2267eedd1c30abba63de0964b4ad5330338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 5104 bytes
font_01_sfnt_off0000dcfc.bin
5a27696eb1b64d643b2978abb528092fe662db1b58e60a3ed34001c594d8571c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10788 bytes
font_02_sfnt_off0001022f.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16204 bytes

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