Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd6816aaea21773…

MALICIOUS

PDF

84.0 KB Created: 2021-08-29 21:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a547c9533968865b14998521bed0dfe0 SHA-1: ac5b1f49e1d201e162ed1f3383f0469ba1b874bc SHA-256: 1fd6816aaea217734e633e6d51f53a82640a0b5a5b265f6d0a78bc179ae0638f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the link farm structure indicate an attempt to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=major+and+minor+details+in+a+paragraph PDF link annotation
    • http://artdealer.vn/upload/fckimagesfile/1dacefad6ff53d15e7be5718427df3c9.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/kogapasaro.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4d5c44446ddd82843f1815858a61f056/650319553.pdfIn PDF document text
    • http://korytnica.net/data/files/nugipuxudojegopawawod.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/lolagafevidewavus.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a273d4e949e---94878986767.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/fulupisukimuw.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/mobozubamifozilaloxupe.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8ee92c73dcf47714641551979c343213/godexolozibu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/49143435776.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/doxodogupadutoreb.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vev9v25hs0f5u01rb3ued0bcr0/9930771071.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750190cd4f1---lakuset.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a342a168c59---95631854386.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/44632276365.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xifavitelirenepubodeko.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faad1746ab4---78447302069.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garalakowikunuxago.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/o1dsc23v57uaaa4vnled5v0ha2/tilevumesokub.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba104e9a2---48836759183.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc840d2f9---42202684958.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dc3ppusbr11jnlin49a9b65kd4/sovakokivejov.pdfIn PDF document text
    • 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_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 17476 bytes
SHA-256: 2844e0351802d300cfb10a4da4de92418219a9a613fc1d63c5a4f06885838177
font_01_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 10964 bytes
SHA-256: d7d4cd35a27d48f236075b82f5337c75c5365655a4196122018a8ebb5b09f8a9
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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