Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da1a67615f708c3…

MALICIOUS

PDF

154.0 KB Created: 2021-08-22 01:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7c67f766b08bdf6f2de7e3450d0edcc SHA-1: 4c4500fd5ed1fbf9db7fb4c93bff7558b7ad58e5 SHA-256: 4da1a67615f708c32ad29505978ff00cb90dc2c7d0a5f05413ee99eb2c501468
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of multiple external URIs and a link farm structure indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/80543273574.pdf In PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/48997513569.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96cd7f86d---rilinefumavufix.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/46301833330.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/47564338799.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d298cf292ca243a4c6fcdc55aa1b61b2/85243674441.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/93600494342.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/9430063365.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bec94c7f1---91775155283.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/tajuwuxovexawidagareke.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/jupemitemezer.pdfIn PDF document text
    • http://www.andreapondika.cz/file/34927752606.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b500de0da2---likipukusuxopepeven.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/68107006617.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/49888156636.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ck83h8pcu0no5rhqa72m9ut3f3/sugoruguvegituguxabed.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/saxunajerumabenilupenuz.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/fenasub.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/611606a7ee5c41468049de93463078fd/88524619576.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9e3c2c3989d11fbad4dcdc2c4c9e2f26/girajajekoreme.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/nepedowijudiba.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa4f444ef---xakuse.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/39771224135.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/67379890e0b3f42af9760bb7c05267b1/barozujuzixasaxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=merge+dragons+cheat+codes+deutschPDF 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_off0001f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F92A 18732 bytes
SHA-256: ce4c5fe1f1e67df493742456697f503c8157ba2724d581a29d2cbfa306287882
font_01_sfnt_off0002285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2285A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24071 10604 bytes
SHA-256: b3f6554b547d225c797dec306f69cf76c69e4c3a9e96e6ae5585216ad44a5f7b

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