Malicious PDF — malware analysis report

Static analysis result for SHA-256 deca2ee367e2c321…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 13:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b48989148c75750858784dbd92060c9e SHA-1: 4a1a5e94178d290d25dd10ff9108807fedeccbed SHA-256: deca2ee367e2c3217be905557b52fa63cadce99914d8856f61947598d550543c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=hemorragia+intracerebral+signos+y+sintomas+pdf PDF link annotation
    • http://www.rify.us/cms-uploads/files/61393573771.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0092c70f66---80940885768.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/19920219128.pdfIn PDF document text
    • https://cubic.is/userfiles/file/4036273341.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/bivokisegafe.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/58210093639.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/wixorizojajuwutuvad.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/nitimoxoti.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/68525524327.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xudejikagebelivaluja.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e0f8514ac---budarixanidalile.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/43475937458.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/71617910466.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119974c96148---zozimekexax.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/84132867328.pdfIn PDF document text
    • http://deforma.it/userfiles/files/bixadufanutajaget.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d0972d8df44d25ece5ebdcbfa09f52aa/xinenupube.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/k463lmdpo4q218ii8irlu8fvio/penolisafesoxorik.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/darofevivazizalo.pdfIn PDF document text
    • https://ijpdua.com/contents/files/jopara.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/95551868009.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b576ca62d04---lijevijurog.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/5473600716.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 18180 bytes
SHA-256: 051cdf28563fbc0317a66c81acdb7ebe09e881c6f95c66076368da514e430d32
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 11208 bytes
SHA-256: 8df5f75f8a883e84408ca40bb98734c915de5329c9bdb395e786d552b4b67864

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