Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8c79ed47a79fa9…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 06:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 142540941b81821d5e872c3159db92ef SHA-1: 56ec1d141549741c6e1cf8dae57ec2ea49a371af SHA-256: ef8c79ed47a79fa9938f4665f7e8d47d72c9e4e2ed1a6cd1d2af9ad6242b6ae4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://ccshecea.org/upload/files/munesifurijerapufuwed.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhlqb2a7vf73856ifls0d98pi0/lifewomosu.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/178208649360f8e456dfae8.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/80632850473.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/dewipatimased.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/venazagexa.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/63546588685.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/70674243526.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b077b955---xikenedi.pdfIn PDF document text
    • http://inercial.es/uploads/files/rixexogofupopaladomajiben.pdfIn PDF document text
    • http://gapp.fr/medias/files/xowuxugabejijusewosi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c6486bedbd4---dijubolewom.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/597643724.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210612143409.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/s5qqtoci2m7tk9bg91rq197h10/26826689067.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/6ocn4nq89tfmspm81ki3o6sle0/1329979573.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/bodafevojopaxojiwarem.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/27058463103.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/apfbj967krsvf05qdoskq3qsl1/96063986378.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/egtq3got6hapnoo417i92b2jlh/jasonuririwapajidenumuk.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff75f44070---84960229532.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/830704438.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b261b66969b---judamuvefaxozusowaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=year+7+geography+map+skills+testPDF 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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 10836 bytes
SHA-256: 4b2f32239045f4d5c1bd8ec0f383d8d71078ff3800b473f225be6092f8db3000
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 16808 bytes
SHA-256: 546a86f0dbad0b979f51e106063300c21aa2cba5d469a7919136b7336288f49c

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