Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f7812f2e82e7f0…

MALICIOUS

PDF

89.0 KB Created: 2021-08-12 08:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb8aa4f74c5fc64af681a2ad7d64139c SHA-1: 58c53e315f7c1cb3dbbdea40b7dd3c361ae37b58 SHA-256: 80f7812f2e82e7f0628ce286c54c02d59565cb40a6e7b2902b2996f4bce63f6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains a link farm pointing to compromised upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. While no explicit script was extracted, the PDF structure and heuristic firings indicate exploitation and potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://zxpgw.com/userfiles/file/berak.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c31a4ff1---87954014238.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076f49ddee7c---xatemebiginewurupafija.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vilirakosuzi.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210723_EB09E2C7E81787A8.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/dajikufif.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/06abad1bef6678ef65750979b07c3f66/21816240337.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/04bd45032130c80206fbc41706a2701f/kezaxabefusejo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/42445342804.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9c1fb1bbb24f2c34f9e3c1689e1b32a0/84763656401.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/77907630772.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lbfe8qucml5jbttjsnvbc4eggk/49521275128.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/vegajipezas.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/bokazaxusekorurorepana.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/bipodijugigoke.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e0f1cb31---risikadegulutaxomuruvura.pdfIn PDF document text
    • http://cloverdiamond.com/file/76658942942.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/gifabup.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jphe00lgsvlr8uvqfvggk4a461/83322807117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=maths+olympiad+sample+questions+for+class+4PDF 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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 17064 bytes
SHA-256: 2e462775e268768f57c134d1b1f0b13681402106377dd347bfa1f0bd51970343
font_01_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 11316 bytes
SHA-256: 3c442ba3297f494725f16b12edd4c247573274037b9a5738db25ee8a2b4ce6b4

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