Malicious PDF — malware analysis report

Static analysis result for SHA-256 82489f3bc20d33bf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 03:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 48d5ba7039d4d0b45b5de12e43de1f8e SHA-1: 4f9033b822006fab8f9aabcbde24d3fd6e76497e SHA-256: 82489f3bc20d33bfb570586bd8f4c98e8c322d8fc60975cd5b3fdc56af069a81
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a phishing trojan. It contains embedded JavaScript and numerous links to compromised WordPress sites, suggesting it's designed to download and execute a secondary payload. The use of link farms on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614710ed999f5---80312494209.pdf In PDF document text
    • https://beaszemin.com/files/wetudisawurejoxawor.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/nujukujefekuba.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8d28701a6---womixa.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/ragugozarojuwu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f3665bce2af848ccbbccfa4b95ef2fad/gudonitonibufu.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/gijixefus.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/vasixeletadex.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/61039899852.pdfIn PDF document text
    • http://araonline.hu/uploads/file/13879585797.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/roxinidaregesif.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/1017401392.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/50829981620.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/jixezevamodasijad.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/92708745683.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/25624590519.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091007431749.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9ec5642da07bb95ec96521addc07c326/3692933486.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gelozirudatefixadomixizu.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/14376233548.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/47439940004.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/nixebinasuja.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/vivagikagowetevowazugele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+combine+2+photosPDF 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_off0000b6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 16640 bytes
SHA-256: 8e55e9e0685cb814282f6a822e33dfd60ca22d56f657e7cb9b717d375f822eb0
font_02_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10812 bytes
SHA-256: 412c057615b586e9e921f2abcbf1e189a8e8143d377dab3d88fe50a9debaba73

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