Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a42935b6ba034b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 10:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50aeb09902bf3107d2ceed4de3d56df0 SHA-1: 87946bd3c19c4f7f1b157f6bd6bc6a45bb66b62f SHA-256: b8a42935b6ba034b56e84183f18cf4b64f4adc67ff683fbbb1344614b733de90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting domains. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/579f3ebe38b2f630910a0239ae472b97/1558594772.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160f05db7aa911---24308486622.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/gogipifesiwutaxoravupo.pdfIn PDF document text
    • https://kiptep.ru/file/81706533556.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e8175a0de---jisuropupaziluniwuw.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/fisizezuz.pdfIn PDF document text
    • https://olterus.info/contents//files/tulodudexerizunatavuri.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/21471287172.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f735231e---silixedelagumazu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e1ced2f1cc41928cf5439b9c1b7579ce/basekoxidufaruz.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/xedonedana.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/kogidujapajuro.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d0b3e4293e281debf91c24f6dd38f280/54252146896.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/pezudezaveruwomuxufurum.pdfIn PDF document text
    • https://digireg.ch/upload/60597609288.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b4761f203eb---sewilefuviveleretefo.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fuwabedi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/48387651102.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/77646007170.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086fd3f12---zuraluvikapelo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/12775871729.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/funatafokij.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4ac0b3c3bfdb7ea964c8b5c05de4e13c/6783976832.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/28616fde0d3483eb844cc0febdfff37e/ziviwabafabijakiwebulupus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ashutosh+mukherjee+books+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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 19972 bytes
SHA-256: e1707d393769a6654c9f87742ed71bf6a938e6919e37971e45a18d438148641f
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10800 bytes
SHA-256: e689cdf551749b3241ebb1a589a89bf1f5fde6b37874bcd37b97dc6a55a470b3
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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