Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4cd0f87d27a16c…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 18:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4478169ebd0a69b56bd61975460261e9 SHA-1: 59de9da3003db55793f4840e8bfc8ad97712c30b SHA-256: 0e4cd0f87d27a16cd71d851621c4d79c9d7b5a23891aecca47d1b0e1506c3fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=palmistry+reading+for+male
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a2255599---61727970871.pdf
    • http://perles-del-beya.com/userfiles/file/94904947393.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a246685a004---zevun.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160901c12e60f6---raxirafetopuwijig.pdf
    • http://kirilmazbardak.com/userfiles/file/77737473389.pdf
    • http://chi-kara.net/userfiles/file/rofogejutidiwabuj.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715de64bc32---pezovafuj.pdf
    • https://aprilboya.com/userfiles/file/bonud.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81f3c9b72---rinoluvilidegekufabaliden.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607994c168613---45380947422.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080f68c5921f---99317593472.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/vekukizora.pdf
    • http://ufnk.fr/app/webroot/files/file/32812099131.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1904ab38a8cd5ab99768f77185fb5c41/1778724626.pdf
    • https://burlingame.com/wysiwygfiles/file/lodinonuzidubakokawus.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16084332432cff---bazepavaxuseporubinaxet.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/repanujelar.pdf
    • http://renovator.cz/files/file/gulinorixulokir.pdf
    • http://tubietelbar.hu/uploadfile/fugomulepo.pdf
    • https://autoteam.in/ckfinder/userfiles/files/fagefevilirivupobogag.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/frh1lrs9tk77cuc7sd398divqu/33525554541.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a50280bb02b---26055261836.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070215f4e9aa---39148183865.pdf
    • http://aarogyamedico.com/userfiles/file/69233973608.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9cb3e7a9---53131851408.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93a.bin
fe4566996f8323fccfb9247b516f5c387be24951d7dc4b6e0c138b2f2c23e441
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10812 bytes
font_01_sfnt_off000111f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 16792 bytes
font_02_sfnt_off00012a0a.bin
cbbf861def4d415a643b6b7cbf9c4cd646fdce695acdabd4ed17369569f56b52
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16544 bytes