Malicious PDF — malware analysis report

Static analysis result for SHA-256 392a13010a682aea…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2996d16f3b76171f87cd196dbdd4d6c3 SHA-1: 733203d9d7be195fa68055431c3eee7fef9fea3c SHA-256: 392a13010a682aea9af4f950899202b829a9359cec411b0f0f4d7059b947ef44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis revealed it contains a link farm pointing to compromised WordPress upload directories, indicating an attempt to host malicious content. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dfec3a40---bijujakuxunafifosofum.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-26/20210626045507732663.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1fb4da6d3bd412b7064a1bdc2b96d533/42407387600.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/57b0jgm0aedph450a5kmrirnn1/58914951078.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/18906011832.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d1878645769---fililusobokububesofawe.pdf
    • https://aawyx.com/sites/default/imageuser/file/71127518052.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16095f71715551---78842013250.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/00c360430780dc3c2b0ac917252f004e/robigojodap.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2881f49a1a26040e02aa56642700afd8/44470375234.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2f5a395ce931df30ffc4b5b217d3ba48/89371910826.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3f53531e3e932b15e832a00ab9264f3d/jakoxanotajiv.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/siv9hdkgi4nd3vh9jo9i0p24l2/xogubidavozugupurokiwigas.pdf
    • http://www.predia.cz/userfiles/file/vamovamagalijufa.pdf
    • http://garderoba.sk/images/_file/54701711129.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/81da36cb06e1e7cdef09a6b06929d27e/vuwejegadefapo.pdf
    • http://7tec.ru/userfiles/files/71213737524.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f2a6e805---gitupajuxibob.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4f81a41b9b3477c3bc70650f3368c05c/safufabaxem.pdf
    • http://mariamozharova.ru/uploads/files/17616898124.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f64f5c8316acfc97bf9db1eabe70ae61/wolofasisuwojavemazakusax.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/6349815746.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ece3a2cc6---nololavukexireputi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=path+of+the+renegade
    • 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_off0000f47a.bin
7578e761c0bb2d2b1986d257e2f5b2c744daa5d8a59475819438714b06d5d7fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 17760 bytes
font_01_sfnt_off00012324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
font_02_sfnt_off00013b3b.bin
d14aff22d7717d0b8a250843b29813fa42ebc3e484b2a694131d14d5cb69aa75
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 10328 bytes