Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf202fc952726df…

MALICIOUS

PDF

92.0 KB Created: 2021-08-07 13:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4c2c78178b833897b6326fd4ec52665 SHA-1: 720360f5e1ee5788ea8c8806da8f23c067007279 SHA-256: cdf202fc952726dfdb2e3bb4504b6aded1d15676358d829c7a966f367f772210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://mvservice.it/file/51798751285.pdf In PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/ravutugome.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078811cd1423---22055128471.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/kokukipobamer.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9beddaff---sijilidulubovow.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/13283158392.pdfIn PDF document text
    • http://cocoal.com/uploads/file/96965963718.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/73511136073.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/76692078330.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/43544044219.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mimixotixumilepagowekuk.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/86111186078.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/10e38f9a45edbbce9d7d8a35cce03b13/93805952069.pdfIn PDF document text
    • http://www.77ice.com/upload/files/99498920662.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/47226493143.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4687031180.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c09f71174---33103883948.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5d043477873b09424c8b1a4e675f18c0/69316642689.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0eabc45b5c16f97d6b346337881726ed/majawuronidalimos.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pefigikera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+the+fuse+on+a+cub+cadet+ltx+1050PDF 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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 11216 bytes
SHA-256: d39743cff461a6610a5cee5cca66afe7d42343a6d2202d49ca130183f4153ffb
font_01_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 17460 bytes
SHA-256: 022b39d38d932a031f0aa110a173f55bfb990112ce9360d34fa93cac41f01307
font_02_sfnt_off000147a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1