Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf4352232bdf76…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 01:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52626080319ec34c159343670eedd0b8 SHA-1: f540a6a5050b7c6c4f74365c83fe882d8bfaaa3d SHA-256: dbdf4352232bdf762cbbb6d1c5ec505a109fbf8191347f1ad09211b1a5cf8e54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391033af2c5---25675465768.pdf In PDF document text
    • http://officeharbor.com/pdtInfo/57668460537.pdfIn PDF document text
    • https://olterus.info/contents/files/5926605922.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/88236883003.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b766152a1---notizabavazojiru.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/rabugilotuw.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/28270437843.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917183257.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vimotesowa.pdfIn PDF document text
    • http://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/32454925555.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/jegirobagexoregulut.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43761116293.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210916205354.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/bodovugawozapolow.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219121452117801.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/sisisite.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/xezitebusuxoganimabujejo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0912e934a---18062975777.pdfIn PDF document text
    • http://pneusmarene.it/images/file/31888535519.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/soludaporobal.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/kaxonomajoreroluxegiwa.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/pubiwifotogabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=call+of+cthulhu+for+beginning+readers+pdfPDF 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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 11172 bytes
SHA-256: df7ed9bc299f6eb8b2a597c6955a3d70217a76862040f47ed50c3ae1550f988b
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 17064 bytes
SHA-256: d3426525902a253cc5d6de77c9627e0eb35671bec2ee4993ad0582f2bbf2c82a
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1