Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca01017db6f96ae…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 03:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e8115459d4ccb4c785ccbabcb713bb5 SHA-1: 6697a046d97104dd30154b2939e3ec583f67c8f9 SHA-256: 8ca01017db6f96ae3d08cc0957ec57a8b4fbca48978a6cdce3fd8b924b0fb949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/25f2b8258f8cdd06fc7c4dc1bce6f573/35234755149.pdf
    • https://mobiligennari.com/userfiles/file/4965319814.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/porar.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b597a35d6c---popujalokolaxinuvow.pdf
    • https://adepotcustom.com/UploadFiles/file/20210520064212117.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b605b21d---xezesibubuxoviruxi.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49c01e7a29aaa9748bbdac9c09255fd6/19916962724.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/928b99a2f3aa8ee477861a2378be6d68/44501432301.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/55cf76c8d80e36ae8d709a5c4591b409/66770766316.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c003991e19---53529576770.pdf
    • https://lienlacanien.com/img_pages/file/24423422584.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbd5080d5---vesofefixi.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e14cf3ed1bf7df248219c3ac208f174/39054641829.pdf
    • https://avgdesign.com/userfiles/file/totiguriwovixedovuf.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/921be8d23ca03f84a88b72fe1c823e3d/taninesali.pdf
    • http://ozkayalartrans.com/userfiles/file/samexobimijipiduzevu.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/59324102725.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df97dae87a---bikobijufosano.pdf
    • http://crescentcarpets.com/userfiles/file/sivuraves.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62e26722d7---261039703.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1bb8ff4fb0591f73ba05f80be036ce02/10208576412.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41eab19132---78745673251.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c039c200a212e90fefdc0b270d461361/vetasizenum.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a702524ca11dafc28ee412363607244b/87333961279.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+old+are+you+in+the+5th+grade
    • 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_off0000e89c.bin
6e1c0c196efee565503d781007f57822253cea00af2f52be092738e586cc899d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16716 bytes
font_01_sfnt_off0001141e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 16792 bytes
font_02_sfnt_off00012c35.bin
55642815e29ad8f41146a2437dcc4bd0c5a40a1fabcd318cd0a3e4df054354c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 10784 bytes