Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c44efd91cc8139f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 12:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac9f6b46e3506fffa58005e2bd451bf6 SHA-1: f9b866a1134d7e91d1121cc5eeccdb4d223819e7 SHA-256: 4c44efd91cc8139f040014bdecf90cc0f7ec75ff7167f7e8089d8bfa43d330e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or scam campaign. The presence of a link farm on disposable hosting and links to compromised WordPress uploads indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=what+is+apparel+merchandising PDF link annotation
    • http://ryanoomen.nl/uploadimages/files/19386120901.pdfIn PDF document text
    • https://motoralbini.it/files/file/sagapulas.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/68584009563.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/99269363045.pdfIn PDF document text
    • http://p-energo.ru/content/file/96972666262.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d35751e78942381f8b30eabe190896a5/baxaxededanoxarikotadarim.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjunpqhm4jpqs301c4ne2opu2s/sasonetuwetuvavepimujuz.pdfIn PDF document text
    • https://everestart.com/images/stories/file/52945961505.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/gefedamososamiguwumo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb974e2df---moveditesazakegopagused.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/62933525556.pdfIn PDF document text
    • http://asqcert.net/files/files/53099002079.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/rorajexobolozenosobur.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/46681308345.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kobuxalibegipibalu.pdfIn PDF document text
    • http://saimiri.name/upload/file/18241151512.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/mapezixepasajebal.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/27213848310.pdfIn PDF document text
    • https://granitnet.hu/editor_up/92694519251.pdfIn PDF document text
    • https://ivanamihic.com/files/fakulebigejokarobeseze.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/66845731419.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/radir.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/pomojerimepulate.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/12036048424.pdfIn PDF document text
    • 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 17648 bytes
SHA-256: 1cebd2c8baffed993ed8bfe107183e6688846f4b369f7c0b0ba5f8f8191520f4
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10832 bytes
SHA-256: 4c018e5a3fc0b3d81513574a617f31bff4fb36ed77f5c3a009d6211510defc2c