Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92cd706e12a2de0…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 15:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 304aef7d33c24e3c19ae4910ea416131 SHA-1: a8f2dd40d0f7935b05448f9a04989f477daf4bce SHA-256: f92cd706e12a2de07d5708c1fb64f21fcf62a0e227c27586f36b6a72478e6a7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution suggest the PDF's primary purpose is to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://videofilm-tv.ru/content/File/60139351154.pdf In PDF document text
    • http://cuiquji.net/d/files/67513513040.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/36538230801.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/10274e6a62e43026786e62ed32254d36/datuzikabiwon.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/8883039290.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/divarava.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044a4701e2---segip.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6af162392295ded544e4cfbea279e152/kijebomolixobegagarapok.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/ritodaxelirilurazi.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/87927507005.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/napulegaluginatirosam.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/53543526495.pdfIn PDF document text
    • http://terminsk.by/pics/files/38629959763.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cc7bf54b21d4f74c9d638e884a6c5b32/85298264025.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/xiwuxavulilupawaruxopus.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/xarogujawukaroduz.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/57511848070.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160858a43c9055---bevuv.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/8059936573.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/d167kip8e2rjqs72bpsnfllbv2/jabikogebimokavomaladuzev.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/fipefesudefalikuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=you+don%27t+know+js+yet+free+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 10732 bytes
SHA-256: f1e44f7ee577207869ec40474b806c8e74e51e0381526a6d4f3c9c5c0e4a1260
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_03_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 17352 bytes
SHA-256: 908fd40a78360a786fec8e8a95b764b035e12b3306bdaf218a045dea4e004010

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