Malicious PDF — malware analysis report

Static analysis result for SHA-256 f433255f8de7a478…

MALICIOUS

PDF

102.4 KB Created: 2021-06-25 23:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa5664761ae5c7630204edbc87bb6c2e SHA-1: ae921b32fadd3900844e8c7a79ccfb876cd518a1 SHA-256: f433255f8de7a478a5e830aff5d4b27a1a4bea27fb13a57e863c73006d18c911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior, with URLs leading to PDFs hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727faf615a6---jemusida.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceee73f0ae---13803842874.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bebcd49461c67ed994976fd2c7bfc797/dedugutenusegizodan.pdf
    • http://haohanlegend.com/Uploadfiles/files/68080688513.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc43199a8---latakinerateleros.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1bdf9ea7dc16b78b1da1b8bd62e1ccb7/viximenakabalemakegitego.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/27b924bbea1582cb2f1ee6951d9d7aff/7218652958.pdf
    • https://ahreco.com/uploads/news_file/lajojuvape.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aae77ea810384eaa42ab3a07148af409/28057527338.pdf
    • https://susta.vn/userfiles/file/95550892902.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e33e6842b---19561677848.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c736d5557---51765346132.pdf
    • https://kham.vn/userfiles/file/fagilotebemolagawe.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/761dbb27b167d5ad6dfdcec2c354f927/89467323622.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p6omupv36d2e3t6l5dbbadd8mm/43322562583.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e70877541---togamibu.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b2a6635b---24860611107.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ugboab3aihsp4lm26l8s1ti1d1/pigebil.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nib4arfm8dn2afbi3mh3n3qb20/66785157272.pdf
    • https://hyundaia.ru/userfiles/file/13261854110.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c952af8b188---sibowakebekidokiroteluguk.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a240738b6f---88605282597.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c079cbc4a121ae6c2ae8223f3b41e861/kokitexevomajojusemumuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=one+flew+over+the+cuckoo%27s+nest+book+pdf+download
    • 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_off00012cb8.bin
d268269afade46fe779be3209da1101a2b3dcba31812d9a0a42573901347c55d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 17252 bytes
font_01_sfnt_off000159b4.bin
e0a6ecc502c0469389128d488a61c88aab2989b1a9407eb1bbcd33822d60c31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x159B4 11168 bytes
font_02_sfnt_off000173bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x173BF 16792 bytes