Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc4959fd1f04eca…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 04:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96e5258166f923e00effb66c35d66d42 SHA-1: 379b79d5556df3f3ac9a0ee8e6462a5dc77f8306 SHA-256: fbc4959fd1f04eca97f46c00e7a1d3254f29493742dc3eb6d0c338e6943b78cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thecargonepal.com/userfiles/file/52710658019.pdf In PDF document text
    • https://mytopics.it/uploads/file/15055956695.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/taxewediwavewedunitukusu.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/ridoluxemefawomonisimilup.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/77c2830228305fa0d03df4dfe74282a5/44898965656.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/20932789411.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/22059872627.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3cc3a3478280cc631990d2c39079cc49/dewuj.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109170458177586.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed87b7a07---pipusiwikujiturato.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/66976394313.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/70069327536.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/xobog.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/73526083081.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/mosobalopot.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/38525940861.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/42056968952.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/jezuxapujefegolaxexekusov.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/vuwilesasarole.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/dojudelikejuwote.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/15453105090.pdfIn PDF document text
    • http://rhondachem.com/d/files/lomixinuxopudefubipu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nafagagog.pdfIn PDF document text
    • http://lovesenergy.com/file/37925255283.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/kidun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=film+q+desire+2011PDF 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_off0000bc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 18504 bytes
SHA-256: fbabe5ffe95ac85c8025f125c15bbd2356221ecd420a868cabd346584564d9ed
font_02_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10344 bytes
SHA-256: 5ea13f5baa273d21e3d3d2332743e6edb0a1e6dd521ee2f3d0aef57bcb62be38