Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d19aea10fc57d9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 00:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e767b5b0cdf00ea10f8637595d03b164 SHA-1: 4518e80b042783098b75feab1955b9053e0af72a SHA-256: 03d19aea10fc57d9071df98662c7aefa176b85aca6b050b8d98efe98b82695f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=mudar+senha+conta+google+android PDF link annotation
    • http://pspectr.ru/userfiles/file/milatuwagusizejapiwu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bfab7f54c52e340821b7bafa367bcdca/40640661045.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/nowafo.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rizoninivoporibo.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/e2d5f76d57ce8ab561fd2bc5b4c7746e.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/1770213565.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/3469994388.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/56732531917.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/56743107701.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/70833655258.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/soxotokupukuxawinopidaz.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/80506361816.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/wenepevabes.pdfIn PDF document text
    • http://lagrupacio.cat/file/fudavekerigameneta.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/refopuvonopubomum.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3df24ac4---11745029668.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc8c8ed123ec4968d31a7eefb1ce38e2/zarazogawuremotuke.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142da56de52a---netixibosa.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/99774287485.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mc2p4mkgqd09bsr31r6pdt0j40/mizulupuwejuzajedok.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/mivurakejitu.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/fuvevobewujojogawosobupuz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/77o5bmgt3lssj1rs31hqv67dnt/javewifumepu.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vebuwijanejer.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad9569482---56553824856.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2eu6onu56dr6s6olshv1trcrv/82208215000.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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 19228 bytes
SHA-256: 1154d805b3e75c441154abd4008c164295e1eb79278f50db135e7c592c8d3695
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 10740 bytes
SHA-256: 5570d7a9a1f105c5c092369d429f19af6e5346fbd60c298a971b9dda48d9bee8

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