Malicious PDF — malware analysis report

Static analysis result for SHA-256 36012fa8663fbe03…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 16:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 441c91340d91888de11ba31ed5febd55 SHA-1: a6ce4ba4b5bb04bef98f49cf0149be14f50d1e3a SHA-256: 36012fa8663fbe03f8bbab4ed627b5d3bcb918d7d00ddede5d23d1ecac38d13a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The document body is unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16075efbc633f8---54610125063.pdf In PDF document text
    • https://kermoulin.com/userfiles/file/71541691283.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/924336ce60002efce733a81c70462ffc/wotijabobifuberowil.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/79213605248.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/rejotijawigutusib.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b092c6935a---likosura.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/13483701659.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f581257a0ca571cf7fb426703a6f5b81/47064545829.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a3a53ccce45ada2bbbbe73011569d8db/retopipikujowokir.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/68bdd71450223a34b5b2a34d1978af28/59346206204.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/padajalogokodizibipalo.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/vabuzexebelemuzavotuxe.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fafadixokamaxivapujew.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/273535ffff206ab8dcfcd198a2284e3e/37495612751.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87871a46f4660b2561ed7df0c22b24c8/78885493772.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081045f44ce4---kukumoketotawokoxenose.pdfIn PDF document text
    • http://msiutilities.biz/documents/8879486234.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/89018724526.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/bupelujaredigiwogeb.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/dovolote.pdfIn PDF document text
    • https://noddy.nu/images/file/60330198956.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/30544605954.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/o6cijbnl8p3spos5uhv98tmdli/rujinab.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/13g31529maf6qipetsbj9897lv/71426164947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=blockage+in+digestive+systemPDF 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_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 16752 bytes
SHA-256: c5f02cc43abee7c2eac2590f94c05a2b68d97899a2e0739c45680e4c889b41d8
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 10940 bytes
SHA-256: c17d0287bae0b3b503cee0d159607c353b802db0c8fb482175f9e91ab502da58

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