Malicious PDF — malware analysis report

Static analysis result for SHA-256 438fc79e3fe2e164…

MALICIOUS

PDF

78.1 KB Created: 2021-07-05 19:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a6b522b6d0561304f9054a0422a8445 SHA-1: bef54efeb36a96dfc260060afd7f2b0ec840fdf2 SHA-256: 438fc79e3fe2e164f73997ce66cd9bdd43a9e8b2e9a06898be0b89ac8fc489a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS upload directories or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the provided links. No scripts were extracted, but the presence of numerous URLs on compromised sites strongly suggests a malicious intent to redirect users to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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) or Microsoft license-boilerplate 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://augsburger-dartliga.de/uploads/file/fovufe.pdf In PDF document text
    • http://ultraljud.nu/bild/files/kusiniv.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/muwifuf.pdfIn PDF document text
    • http://arslanemlak.com/E/file/baduxokape.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16075f18801b77---1578268026.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/76215439025.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b2b941e81ee94019ac4ed2acbd129e56/naxixixavipimubigebagelep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d70ccb43---joralatavoteguvupif.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/fasel.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c180eaed1181482b85833fb05da80855/pojolujodoberilobosiv.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcb8d4f21---titokusafejatoxenosutez.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/02983cb429d3fddee350fc6e1dbf6311/gapedu.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/90018301609.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/punupexumipofam.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/besalanamu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xoxuwutewiguxege.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xeboronexi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947dd65a9ee---83999025762.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658f827992---54577381091.pdfIn PDF document text
    • http://babamoleskine.com/files/file/90198163443.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/s5gttd3h21nl7qqc21q0kfsco2/dawijenuzubozexesu.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/98269628230.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/41489877090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=world+prime+beefPDF 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_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 18360 bytes
SHA-256: 74188cca9e8e0bfbad1deac4bb66ad475413b16a8cd174f707f2e0b6e3c67de1
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 10260 bytes
SHA-256: 8db1f384eac2887f6322d456f782232542031e80ec2e485e5d12484934c53e54
font_02_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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