Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcd0df563a5e6e3…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 18:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 223c86678bf57446dedfe3a4b3467f80 SHA-1: 7d7197c0d0a5ca7c5f769df7afbfe3293fc06111 SHA-256: 3dcd0df563a5e6e3a93a6e950856e5d9355715fd641b0ea6b0ffb87fc4053fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=which+processor+is+best+for+gaming+in+smartphone
    • https://sportnazona.bg/f/uploads/files/tojemebuloroj.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9e543bf42b54d3a3a22eb348c1cdf312/sirosoniras.pdf
    • https://yomadesign.com/userfiles/Proj_Name/files/dirixususekibewojudolex.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/gifazusitig.pdf
    • https://cuatudongsaigon.net/uploads/files/68545700064.pdf
    • http://npi-management.com/ressource/site-image/files/nofijajezonix.pdf
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/38908985754.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tagijupopufeso.pdf
    • https://panificioilcavaliere.it/userfiles/files/milibevewugalimiv.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/verigojuvigaxumozop.pdf
    • https://digireg.dk/upload/lusofufoxirawotitugejama.pdf
    • http://debsecond.net/UserFiles/File/rolovax.pdf
    • https://thepainter.asia/upload/files/towexemanazozi.pdf
    • http://myxroad.net/upload/userfiles/file///variz.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/47ef71d62776040683880b3648d6edcc/gazajet.pdf
    • https://dananeye.com/uploads/files/202109042047489871.pdf
    • http://puntolinea.org/userfiles/files/fufovizujuruderekunif.pdf
    • http://contrast.no/ckfinder/userfiles/files/20267862245.pdf
    • http://cansuyu.org/resimler/files/najepuvojefojuvisaporezif.pdf
    • http://silver.jo/ckfinder/blanc/files/jukexitexikibafajopa.pdf
    • http://mh-gartengestaltung.de/userfiles/file/64612893982.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad0f475a1---94017440117.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_off0000cc6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 16792 bytes
font_01_sfnt_off0000e485.bin
76efa53618d1bfc1f8d9e2986fba518f57757f62703f66487a6aacf4a2aa8825
pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 11016 bytes
font_02_sfnt_off0000fdc9.bin
05f06d4fecc69bceb59d50c540831ba6db8df12a3db2fea5c940751902c8a473
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 18068 bytes