Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1d3b39468aa293…

MALICIOUS

PDF

88.8 KB Created: 2021-06-25 21:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0342b62933f1fdab082958a926c91cf SHA-1: 526a0d9a07937a13f6921ffa46cf4164bbcacc64 SHA-256: 6b1d3b39468aa29320bd3b3688d543916b84e34b9c3358c32e58fa7792c49ff0
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to WordPress sites utilizing the Formcraft plugin, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links per host further supports this. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c512428cb1b---36877125617.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3b95a9cf7db50019af6199a31cc3ecd9/vifutetepavalutev.pdf
    • http://exito-opakowania.pl/userfiles/file/63095144963.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b043f3fcb9---11437754247.pdf
    • http://dobrasekacka.cz/userfiles/file/lobivuwuvikek.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a015e2e03---40169163715.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6a4ba6187be83a913975aaad81d46a59/lapomeka.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/6047154416.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ab37010e4b6b28057f9a2786551b68bd/99410457657.pdf
    • http://akinmedikal.com/uploads/file/jajatikekufafelono.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a52f5b45b---tijawevudikefigixa.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a18b588e2c---38416534809.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea0597a87---97016647428.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1e1a9085---36705978042.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/nisun.pdf
    • http://bualuang101.com/backoffice/upload/files/fonedapamasazugen.pdf
    • http://yuha.be/_files/file/88359027433.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d819a3bd18adcccfb26664781adaf2e4/35702406269.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8be9a415817a8ac40d5c81e3640aea91/refimixepowerowukovim.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/er2cme1sqktgvdldi0mhd18051/xifekutibivevu.pdf
    • http://buddhavehicle.com/userfiles/file/nunukejudekumulapa.pdf
    • https://aronabritcan.com/userfiles/file/57694160464.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=peter+greenaway+the+draughtsman%27s+contract
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38e.bin
a0a1b6d278cedb4572bcff036eb316694546276bf1479e96b05f704bc01abdd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 11012 bytes
font_01_sfnt_off00010cf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 16792 bytes
font_02_sfnt_off00012502.bin
009aff028bc55c72e62623b64b047c065f8ae7b99e2a32d057372447fdc7ee9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 18092 bytes