Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0197291fdb4515…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 17:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fd8733730c2a1b766263c309e4e1fae3 SHA-1: 8699b1c498726facf9bc1453fda8bf7e1e4470bd SHA-256: ca0197291fdb4515ef2e944bbe449a9ae7d47f26947e505644c782fe927fd3c8
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits multiple indicators of malicious intent, including heuristic firings for compromised CMS uploads and link farms pointing to disposable hosting. The document body is heavily obfuscated, but the heuristics strongly suggest social engineering lures related to browser extension installation or callback phishing. The presence of numerous external URLs, some hosted on compromised WordPress sites, indicates an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=husky+1500+psi+pressure+washer+manual PDF link annotation
    • http://yuli-china.ru/d/files/86447963189.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/58986590240.pdfIn PDF document text
    • https://avela.md/userfiles/file/9792282823.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/ruvikadovolowegolebi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f30939845e9dee4db1b98e219e4a4bf/63485387021.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bv0i72o4g9665oic4iogq6jcc6/vozoze.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874401a53b7---kepivekizab.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5fvecn5td167ouc392hknspve0/bexar.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/10888985329.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/mcvmtsdg00qhm7gj0v7iiitti3/61327310401.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/ladukofomip.pdfIn PDF document text
    • http://dongphat.net/upload/files/55493953348.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f63588228a3---duxupipi.pdfIn PDF document text
    • http://erex.hu/upload/file/20330307027.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/kobitilozixejigojuwomu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/94065212563.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a813c6756---29543007335.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/buwowimuxogav.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/vasefutakipepegesumebal.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/tevadezarejawoxavomij.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd791a8fa20---kepagemulokiwajewa.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/gekajuvazekuwoxusovo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfdbe0d1ff---fopapetilini.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/75782540993.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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 17208 bytes
SHA-256: b8ed2c5592fd77686dfcb8186e26c271d0df6bf6f0a69c972171193c65cad5ae
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10992 bytes
SHA-256: c84b105472b6fa743337e90412f62c15c76d10b92cdfb2b5e26a2ab506addf59

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