Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a10085826e9ab87…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 23:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 127b87b8097b317c6b9ffa53b3fbf67d SHA-1: 22d9a14c92a4bd440db7b1f99d884505acdaa357 SHA-256: 6a10085826e9ab8785893910aac588b0f360cc319b3ddade09cf28dad60d42da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external links and the ML/ClamAV detections strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=tc+electronic+hall+of+fame+reverb+manual PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a68b748781f79ade23f7f9c7585956d1/54036895268.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/jawokugabe.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c37eed89f---bunagavox.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/fafado.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2fb263cae---43990575809.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/menabolevimerulame.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/99111336434.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/piradukepo.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/duvopigugak.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/gegalijovuzivakoka.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502210604226.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/wirifevawejikimenenaj.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ki1jabvtpmhtsi6be2jdekjpu3/lexakogewugepewa.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/80be81be4ef866ea42059404eafd27bf/wujugibarixosidina.pdfIn PDF document text
    • https://mauspro.net/upload/files/60938631859.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a30c0fa1b---36207132535.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d543b56ed528b2fd608e340b2e35c05b/rofulazagogok.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/ledonijananazibigapi.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/faxuketukawasomevubujute.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a3c012b5c7f549f68b04e6019a68c123/88388944289.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/devakorekuzilileb.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/somipukutozam.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/oag6ungn243m6tti3u2chjmnn4/74461838183.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/d66d6fosm7f1sddml30anm8qoa/kozowapetezixokis.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3oa81k3ulc1llt71rudc0kjt16/17090879114.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/devomafuxas.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/15598460120.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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 10704 bytes
SHA-256: 439db1155a18d802e413d04c7b71b8020e493d4330146d1060e07424ff74c0eb
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 20668 bytes
SHA-256: ccb444dfc9e99195dd1e72a834d7da0443ecb0f3bd3ef20aba2f9cdbf69eb0cb
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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