Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2b460c3a99de7f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 08:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14049c85082a38e0583c22cd9171b485 SHA-1: 9e45c41da5f990c9fa63b08db8993f51c72285b5 SHA-256: 3a2b460c3a99de7f105277d2dffbbf0b7ff6113005abfbbe84380edaa8c3998d
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 indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of numerous URLs, many hosted on compromised WordPress sites, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://legouic-peinture.fr/userfiles/file/sogalugamut.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b51aa9a192a---54342166306.pdf
    • http://benthanhsgfarm.net/images/uploads/files/18710065880.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ae62a6f6---12530733636.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f9143f322---mobagoseniwifoguvus.pdf
    • http://goref.ru/files/file/bupotuvulekimexo.pdf
    • https://palcev.ru/userfiles/file/33354808678.pdf
    • https://mehreganimaging.ir/images/upload/files/limunaniketaz.pdf
    • http://placc.info/up_image/37060856133.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d40c2ecd7---78371265954.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160888c1c795a5---zedere.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844f670dc0---35415391388.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/33363895815.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b918a9cea9f---degefowoligadeferulemu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608641bd9c0ed---laxoxosutonawop.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0622f3563284736cbe91ab1fabb5708c/vumudi.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f399aed72338d54b06cb088144fcd533/raraxulexuweta.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984016f0056---37604040393.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2495a02cc---66195607107.pdf
    • http://dungcucaytrong.com/images/files/29002937921.pdf
    • http://www.colormotion.cz/UserFiles/file/59688300047.pdf
    • https://mmagame.com/userfiles/file/67785370536.pdf
    • https://akproauto.com/nbloom/fckuploads/file/14196624720.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee45867f3---94607699547.pdf
    • http://fanti-fitness.pl/uploads/assets/file/97086825228.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4d0f759c76a62769d5c7d69805f4ed11/lamubukikijukedokoguxigos.pdf
    • https://study4student.com/cache/fck_files/file/50330702889.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+wanna+love+me+the+way+that+you+love+me+for+all+of+my+pretty+and+all+of+my+ugly+too
    • 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_off0000e822.bin
4fb1a2fcd5a48e6c530c40c0f485fd846fb3af56640941555d35f7f083eb6516
pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16828 bytes
font_01_sfnt_off000113e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 16792 bytes
font_02_sfnt_off00012bf7.bin
aca84fa5ad34715490a6f1c2a0aa48da8f8164c6efead1c19bc7b44491d7ee04
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 11004 bytes