Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa304b8aeb34a67…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 19:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce0e062896aff3183d9ef6a955d0d3ee SHA-1: d08501d846216626dbdcd1a1ecc65134e05bad2e SHA-256: daa304b8aeb34a67e49bf1b437f7cb0e7c6f80f6b8735f917b12c8f02bafd99a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains embedded JavaScript and numerous links to potentially compromised WordPress upload storage and disposable hosting sites, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated, but the presence of a callback lure heuristic indicates a social engineering attempt to trick the user into contacting a malicious actor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sziszolg.hu/editor_up/41802774703.pdf In PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/10435672492.pdfIn PDF document text
    • https://fasaac.org/temp/files/bezamukobowusujifaw.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/71268595357.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b853c0c7---puxirojazazuguzawig.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/lujupegujatuduxubiwajuf.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89928237411.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/16341745536.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/2580519327.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8d6c930b4---92595889491.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/livuvi.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/kenekixuxekobexef.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60646565694.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/75058399599.pdfIn PDF document text
    • https://interconformity.ro/images/file/kevifebapatujigoxo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4f47040beca8ed1ef11bc42082e4011f/bikatabigof.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911202314.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zodasenagofejuxod.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161415e376b00c---xodulilirasumuduboduviso.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xiwekekinuseduniluwin.pdfIn PDF document text
    • http://twilaw.com/files/files/totike.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/80116303613.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/91152739494.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631256468.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32275773384.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/82860729138.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/sixola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=smartphone+os+marketPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16304 bytes
SHA-256: c5539e42a13bea20ef44ed3a50cfe36acd6f2ada592d2b360ba858f242c9d42e
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10548 bytes
SHA-256: 33cb473b7dee50f3564e84b6888a649551fab9c3c432ada2dc2adaedbc651057
font_02_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.