Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aa921bf6c94e0c…

MALICIOUS

PDF

99.8 KB Created: 2021-07-30 20:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae008ac9acdbd365298e2e02cb11f7bd SHA-1: 3b253ccd1ef8907a6758b1c6df7ff0560f6cec75 SHA-256: f5aa921bf6c94e0c133ac9e42d71244e975e959281bc8cfbd855863177a692f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress upload storage, suggesting it is part of a link farm designed to host malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=what+is+lge+hidden+menu PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2616c6c05---fesurugote.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9108d548---najedovexisukinolizur.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087070af2b38---sivetafimezuzefogon.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/89465005755.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/gegirivobotuk.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/loliwopevekogan.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/706722674.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/24570951935.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/86us26bfgro35f7bnvtipaj0ul/fomekid.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/76520641793.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f81e690b---18654927973.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/29593258469.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/63152628960.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b3e871f50cd25b121695213773362e24/44508956372.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bc2939df2b9cc7d0ba149b4a0619ba19/pipetugojakeduwabuzavexub.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/63807933353.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/35039120703.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/49207268593.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/58a55e0ee5900db5ae25527eef946ca4/95448459882.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1a220a4c727bf6b811cbfc8ba4b47226/juribilubafakokeb.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/fizakemojopabigaj.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/nenutaweb.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddab5093d---88911073211.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_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 10568 bytes
SHA-256: 8ee3a9968d12d117f37ead023efc4d4029cdc548ba08d7f261c5a41e25698ef7
font_02_sfnt_off0001535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535F 17644 bytes
SHA-256: 8d685ecd763d4a01f86fe401f10137db06067a9c3e7fef09324621611858ac58

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