Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb392573fb56e1e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 03:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e313e3847469fdd45e60902d76e57cb SHA-1: 79c070669ea386cdced4488e365544985f1b8ced SHA-256: cdb392573fb56e1e9f5455a764d5623d588fa1b5aab477438db4dc6b04d852fb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised websites. The PDF contains links to algorithmically generated URLs hosted on compromised WordPress installations and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of external links and the ClamAV detection strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2122

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=programming+erlang+2nd+edition+pdf PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/e7j73ea12urpvbnc2kv57fpm3h/80228026944.pdfIn PDF document text
    • https://miet.hu/kepek/63418983551.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/8067475864.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dc81bba9---ramovararuriwet.pdfIn PDF document text
    • http://merwepizza.com/upload/file/16322716339.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/6015176119.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m1o87gm9t6urn0mtpaaoss5ms0/63797680541.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pibovemekumu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/dilomuwelurukotilese.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/24136571098.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6a1bdac---90913241139.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021073017502373499.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecedea2334---jenalawenuruvis.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/wamiputogasikul.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bagowimikubovibusexavasi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3tv5g3n99cr3cggd7c6hktekd8/pupakarolipufazirusinedes.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/518aa6f588d9c0ca4474032621eabd2f/42166289810.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e581600c---givamozunajina.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/m37ibfo3f19npjkgdl4pbov425/18175298156.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d63f5172f---debop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c84bfe44---92358878796.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839ea540f5---jogala.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7b5792d7---jupomoluz.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/55012410062.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 18264 bytes
SHA-256: 37ebdeddb8de80e320917fd91e61242c99d7089bf2e3135c2a9b854abc71bdb4
font_01_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 10792 bytes
SHA-256: 65d19bafc78c728e5f6d0fc13536b8300bfa8b7e4a9ba2c310176d1562972b11
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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