Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cdec1ca0c52157…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 01:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e76bafa5bdfba978e6319a2d79b3e30 SHA-1: d9d09eae1b7fa91d84311d6b6716b252588181d7 SHA-256: d9cdec1ca0c521573d51e312428a92949802c31cefbb052d2398e02651a87c55
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious sites or engage them in a social engineering scheme. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://spa-salon.ru/ckfinder/userfiles/files/6261697484.pdf In PDF document text
    • https://marupyara.com/fotos/userfiles/file/37551845232.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/sakifemapule.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b99335fff---2049645506.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xolawitinitanuribimo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2d1dbf40211dcd244bcad069f864946/nexasoz.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/pogalojuzara.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/15617409329.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/tevoda.pdfIn PDF document text
    • http://safetruck.gr/images/file/xagugurorifanusemafarad.pdfIn PDF document text
    • http://juncheng.tw/upload/files/zokorobafetefonigabof.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tadojedakizi.pdfIn PDF document text
    • https://harom.ro/files/file/lolotezafajidegogafexu.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/nebiwulebaditeb.pdfIn PDF document text
    • http://rentaruedas.com/files/others/47566417432.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/zivedasoragud.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/kokigemilema.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/37550737684.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/48591111894.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/zopirepejagew.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3000321---lavotidukuridira.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/70372927458.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/wufepadorukavodiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=verizon+wireless+prepaid+plans+reviewPDF 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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 17820 bytes
SHA-256: 0535ed361dc5a3b26de5873418f49dadb8897f7d2261b639eb4f9003d755ce1d
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 10468 bytes
SHA-256: 5952bdfd8dd0ab1f447a3896ad032ee913e8014468479a4e8edf10a3805916c9
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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