Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ec5659bdc6ca79…

MALICIOUS

PDF

82.8 KB Created: 2021-10-20 18:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2401d7200400d713946274125e49fbcf SHA-1: 80beec2cdadfb2bb5d9a9747ff93d3788c928493 SHA-256: d6ec5659bdc6ca79cf025ea06f489d25c284574fba109f61df593591beccf062
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162cfa8e7a5e---14987498978.pdf In PDF document text
    • http://wu-pao.com/upfiles/editor/files/luzitanekazipotugigakeja.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/50249754475.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/inval86509n7ioqgr3fug4b4jg/nixipuxofolarizitiparo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/muzosenejotabodokuriw.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/5472714952.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142b639129b1---kevozodogajunuxemoje.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tizemuj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c90123bf562be30406dca36faf799138/21648527028.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/77462063856.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/belitug.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/61402916937.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/juzonofotulepesegeduvejid.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/mijolipisigakebofub.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/82709658145.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/rifefisekexowizofawum.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/nesaxopazazozediwosuzetun.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141772ca0097---80933825331.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca1e8fb38---dovibifebuxupujux.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/sinaxeloja.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/sonuvenesazuzo.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/butaledimovunev.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/patexowavanabiz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=sql+dba+interview+questions+for+10+years+experiencePDF link annotation
    • 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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 11616 bytes
SHA-256: 334301247614e68b86aa5c396fbf8c4811cbe310f4b77ef4935d4320e493abcb
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 17428 bytes
SHA-256: 62b6d2f5755b2aa168d987e4e13d7e1eb1d1cad9b65d8cbef4064e35e8d58565

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