Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6318acc57cdd97…

MALICIOUS

PDF

70.1 KB Created: 2021-09-08 01:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf683ef38054dec607e58b39f84174b0 SHA-1: 3f81aaf6d408eb071e84d9e5563f363a83d6c604 SHA-256: 3f6318acc57cdd97cf494e1b8d71da682a92d5cfc0d88a933bc656a82d898fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9db17db96c1f591f211b588f9000c73f/tuwezav.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607735386b8f1---ludekesimo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c849202---nawojonajaserate.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/79f5d266f5548aec410bb6969ff5a1dc/64411186100.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/25640772801.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aeb7dd0068---36633411423.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/gaxiganufuwo.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/60720836999.pdfIn PDF document text
    • https://dhesient.com/media/lapokanixuxobim.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizejowovew.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/ruvelutokow.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a95bee8db67f459b9c3e6f0ab7efe401/90350604893.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/ropofobadudojepem.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c328afc43a471cd02febc5f8aa3a402/9839313737.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-12/20210812123614438220.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45dd98a72---sulerajefok.pdfIn PDF document text
    • http://ipllaser.in/uploads/91026461643.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/72721013008.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086999e23860---mumivosone.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/3088252321.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ririsobu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a090851fb---57831483892.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/58fb4e06dc1ca279d8c2af0fa42e3a84/welejidotovinubuwunut.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/74093888759.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lsmifoj5iuvn3rapbdfesaqbd5/65692896137.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/47379891948.pdfIn PDF document text
    • https://dhesient.com/media/tibotivomojazafemopijorig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=danny+boy+sheet+music+pdfPDF 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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 11092 bytes
SHA-256: e752c247b7142d28e499cff164237dae7886cedf792cb9f3fbcffb9583c55928
font_01_sfnt_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 14556 bytes
SHA-256: fce5a247345e8304fb669e5134e5d5d725cc87b8769a5ebb950f490237d70c78
font_02_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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