Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c8f8d55fc77c1…

MALICIOUS

PDF

83.1 KB Created: 2021-08-31 23:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e9566a425932ff00781d0cc5e183ed8 SHA-1: 73135274c9f7a94969b2b93299e767ee89f5f32c SHA-256: 845c8f8d55fc77c1c7cceefa8b71cdcc760bfcc0a9c6cf29eac50765ae84b759
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV detection and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for support or billing issues. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83078544b---lesujepur.pdf In PDF document text
    • http://haithuanphat.com/uploads/files/xebede.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dukuroforevenuw.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102f1aee6e69---50918871006.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5397b27d---75274011828.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/nedutaxitomo.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/36104434768.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/48916065087.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nec23s9rjduma3b37iejc27mat/bimeguxelikilokunitipa.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb6670a1a---viravelufewifudap.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mapefusifududigawig.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/55281599583.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/17782847507.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/moxet.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7e10414b---23453430224.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/nupuputux.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8136d660---15087465422.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/42808830875.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a08833ff7---40331514073.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1901a24655ed41e5ba6f88ace9d66546/44124749585.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172131517761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=differentiate+oceanic+lithosphere+from+a+continental+lithospherePDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10744 bytes
SHA-256: 3e3b4128d745c452637db14536b36e3f37ba3d3b828dc70d047b76d279ccbf41
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 17540 bytes
SHA-256: 9b35beb01bc093980a1eaac9ad5b231dcc57e5990ba801c10de3b68dd845e232
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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