Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7d9ac2e280ac13…

MALICIOUS

PDF

89.5 KB Created: 2021-08-06 06:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e6ed9c59247f856601fa8d38f4e5bcb SHA-1: d8472c6073a6ecd5c549436155cdf2ad48a76efe SHA-256: 1b7d9ac2e280ac135c7149a5be0ad59bfc67d60a20daa650c4ed70da66e3706c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress sites, suggesting it is part of a larger phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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) 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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160889511f3ac2---mubiwaberosu.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rpfdrtp1l96kddrncto7ucj3v2/gigutebek.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a5ec6f71972a9264b6e1091bbbf58885/44028891133.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/17100639250.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93e8bf0ca---25778468807.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/55457901960.pdfIn PDF document text
    • http://www.celso.org/download/beweninuwozurutufiva.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db761b5fe---lomoweziwamupatisaful.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/5198115370.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zebabase.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb79ea5fce---52851645406.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3641f82be20d54a90b1988782a15a548/wabuziwurowipolibip.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/gajajopizesa.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/dotadenupedobuwumiruge.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7a497c8d---55695374996.pdfIn PDF document text
    • http://enerkonelektrik.com/ckfinder/userfiles/files/jexelopox.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/96267926005.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/84feus4ffkj53fbhtmqb6b3k8u/68408128558.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/wafejowuzuweganunu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/3509338112.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/romenowodutamotorilewab.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xaraxexefudisigo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ac916e85---gukabogodakutodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+enable+call+divert+in+airtelPDF 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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 18264 bytes
SHA-256: c72f09f0fadfc44a15f959a5fb0fd9ebb6dabca3dfbe695dc5e1e92908f4ed50
font_01_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 10480 bytes
SHA-256: d68c1473f16e0b208f2ba79eac6df9cda0bb0d3f3ccf2a6b9cc4d5db4dd5a073

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