Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd61a180214fe222…

MALICIOUS

PDF

69.5 KB Created: 2021-09-06 00:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c05845a721800a1cd31ed22c66f56507 SHA-1: 3af448ff9bd23d203b6b552b5f1d6145ca4d48b4 SHA-256: dd61a180214fe222f374de17515e32712c28733d71df97eeb979a754025a5fbb
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the final destination. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, rather than user-readable content, reinforcing the idea that the primary function is to redirect users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://beastyenergy.com/userfiles/file/68513979225.pdf In PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/82553996537.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/4239135579.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4485154140e3136ed2aa79f9581f582e/58935583544.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/77330213611.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43bd281638---poreziviwowezibefonugijes.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0236bea62---75933975312.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vujewuvijawiwodurisedibu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/tevusod.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/kejidapisewusitobimikozol.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/lebojana.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/33733404384.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/91432598152.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/94700977085.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/8089582704.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/kibudukafosu.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/2985771984.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48ebef9bb---82257540325.pdfIn PDF document text
    • http://agama-rc.com/upload/files/95782929183.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/64138657197.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/befanabit.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/55cfb0b0f6de41e71881a23bc47e3d2d/54524203604.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/pogamerivaxutej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=appsc+polytechnic+lecturers+syllabus+2019+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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 14380 bytes
SHA-256: 7c89cdb54b4448de7ebf2943a8fdc106a93d3a27efe389414cd954a73b3a55fb
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 11516 bytes
SHA-256: 0e56e35cf5e6bb37c3479c3e394a827cb1509a3745228561c2d5035917eb745c