Malicious PDF — malware analysis report

Static analysis result for SHA-256 30db91c9531bdfb7…

MALICIOUS

PDF

99.5 KB Created: 2021-07-03 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dbf9c49739c3dcfaf4388ec5b846b201 SHA-1: da0c475ad07966b1cf1c4f2381e8dafb8cec595d SHA-256: 30db91c9531bdfb72493ae132a46a69c5b7f0ae2b731bc0961809a6f45b94c94
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://hanifeugur.com/image/files/36105140906.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ca8d7393718777ce6771bd24b57e7a98/ravitokolevulusilixagiw.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f9bc0b510196ed02fbf65e8375d63f40/69574541981.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607748ebcf138---danafedowumujobavixekoj.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/sexopatuvigidanaxedewu.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/todedazoxuparomo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/56e1bbe3e925a8ce2178a8cb154b864e/fojewokuwapabimokezegis.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/mevijod.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920ab4424a---92922659745.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4d117c8b---52204039632.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0efe901dc9d8249ccb3dfa9b9d860ad7/bedusilazosipajimowa.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/682eeff89c3a9ec2473340cbf4a40508/15679498652.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16084084cab784---66716304843.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cf0e5ca0---dupidiwore.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/jagerogudelumewigiza.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/87380602694.pdfIn PDF document text
    • http://centronegozi.com/public/zekideb.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/81237713868.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/76ef15fe3cf56710893992c86668982f/gadovamegupodano.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31df450b51---28053390241.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/23147318.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sinefubovamezebolisi.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/49258980236.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/31939523787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quotes+on+being+brokenPDF 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_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 17460 bytes
SHA-256: e8ca986c9c951ff998777ecd52630c41d8c0ec805fbb021196fe45583275546d
font_01_sfnt_off000150b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B3 10468 bytes
SHA-256: e6190659a1516b42351166abb50ecda14076fa9d34b9b443d0a10586a9668187
font_02_sfnt_off000168c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1