Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cba53fee22b590…

MALICIOUS

PDF

87.0 KB Created: 2021-07-10 13:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a2c0fc98bc1d4d46b56d90a8484c79f SHA-1: 4b034d003704e7c32d7edc92e8ae88dbb4ba8a45 SHA-256: d0cba53fee22b590d8e48dc44fa5bb364b9fc8181a5116af459bd19bbdf25a4e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://777mto.org/contents//files/72455583668.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3b118baf5f49be6040f14fd7b9f1fc6c/pagopizotalemo.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b489596758---34061780949.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h19ea3p39nbms14f0ipa6e7g8u/22507068930.pdf
    • https://alakharia.com/public_html/userfiles/file/zoximibiwawetunumojenazin.pdf
    • http://mp-journal.com/media/file/31250361186.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9176eb5c4684465d9b86e7d22c3111ea/19519904161.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/f2djtdgvd15d2ivqq2kdikgjd6/32859682132.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfad8a6e4a---54064606214.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9895ff60---xewigiwejazopopofov.pdf
    • http://arcomproltd.com/userfiles/file/94177753062.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/80caf0c73e6bad16fa0b521c68f2fb61/wibago.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9a675fab870495d2735550a036a5077/vunuru.pdf
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/55001174852.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c451112a3eb---jetaxedomaniwaxeloxunu.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/80ebf4df04b9e5f933aa38314af18a12/69391084266.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0cfe1f8c8ba75d506f489dba4a93d378/zalifesujiriborirenabuk.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/537ef8f2386d174ddbb0251fb3a8cb24/fopoposowukobiseniwod.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160adecf6e2464---83649932832.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/568513ff0624b596577fdf20f9ce5290/pegasovanor.pdf
    • http://aklond.com/UploadFilesfile///2021050404565720.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed52a57df---57281353712.pdf
    • http://teormech.ru/teormech/usrimg/file/kotubexu.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b437dd0e---jerukam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=structure+for+descriptive+writing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 16792 bytes
font_01_sfnt_off000108f0.bin
322842af0b99ac7841e499649f2156d7d5da3a8201f7a283d2ab587e07b0d4d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 10916 bytes
font_02_sfnt_off0001222b.bin
d09de8b3707de5944e7b7d7f6b9c4b208df72631ee947c0ac56196143f0ba7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 17060 bytes