Malicious PDF — malware analysis report

Static analysis result for SHA-256 575661da4557c125…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 17:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b10754bb138057358c6bf458516b6beb SHA-1: 1607dd4a794cb44c013d3f1e6fe0475f7f99f1f3 SHA-256: 575661da4557c125f8ba3b4de665bf4e5eda84882ec627baed7d21ab6dcc5fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=specific+gravity+of+civil+engineering+materials+pdf', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/uplcv?utm_term=specific+gravity+of+civil+engineering+materials+pdf PDF link annotation
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087243b3fd9b---mexotalexaw.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/24089265696.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/40641812736.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a57276d1cac---53959765080.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60bmkasbg2cl7pusan7q12utj5/mumegapowinowekajow.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ce6747824b71c20e0c768fd4504588e7/83580208101.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210618042705_m694l0.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/50835119639.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e84c80b165e52e5198aff0fe25b7f281/54609798634.pdfIn PDF document text
    • http://thaide.org/userfiles/file/rituvisujixet.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/sagav.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///83894326341.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc3d16ebd---43046691866.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/42e53420b5e2a8492dba30ae1a863e5d/jagaramuzab.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/zuragusalutifikukoluz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bc6f1ecf---jikemegogetorarozugoko.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/34468445810.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a645de03cf---45168099937.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13366259267.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q66aolremi3i0hgfhjfklqk461/kitafutomewup.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/ruwifunilu.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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 17440 bytes
SHA-256: fd6df1ebb74d222764282f2e8552d7b6c81a63e1669ef827a87983db02f3dccc
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 11220 bytes
SHA-256: ad1ed1be7df2cba500a3ffb8d40ae56e2b4c7e05ade7579df01cc064b4b722a7

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