Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce601a9fb0b21184…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 01:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5b9d57baac49e09e5dd6cce5fd6d459 SHA-1: 64d4686cb8154b8289c5c7a7ee209438ee346e10 SHA-256: ce601a9fb0b211844e5a87257690f9a4fdb102e2613a51c280e6ce1282bceba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to redirect users to phishing or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=three+examples+of+application+software PDF link annotation
    • https://officialbacknumber.com/editor_up/30356143255.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/11057584808.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/78078519069.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/fokifuxagavitifowuzusur.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/87291235340.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/nadifamoguxovalalutom.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/871b7d78a8a3fa7c6004241625d1651b/36508969704.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161342c884afc8---sujewawitaj.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/309716285.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/89030715722.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/45587821579.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/38844560208.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/muduxares.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/limesaxutizuxonurabeluj.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/doworul.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/tusefeminifibi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a1f6c1b9b---gifamijiwuturefi.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/89347155515.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/19177644225.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zurulezinipevol.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/15432190876.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/nudopu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68cf202f1---18950081415.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowutibab.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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 10896 bytes
SHA-256: 0bf24708510ce9ddacd095fad6e4ee1aba2efc0512cfddb1a423c05ab31926fd
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 17276 bytes
SHA-256: 322348ef8b9a8d71c7ed1df1fc2cf0b8aab4b0b06f88625c48f9efbdab12d561
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1