Malicious PDF — malware analysis report

Static analysis result for SHA-256 506b185e472fe162…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 09:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e4f7f66fd8c22cb810a317d04783a0d SHA-1: 5cee9e7591d3c0a221d20b8566520747bf9d7ad8 SHA-256: 506b185e472fe1622b8a50a59cf477808f8c64ef3df84a6227d100e026f31684
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The document body was unreadable, but the presence of numerous unknown URLs strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65ffc6d250---79638604286.pdf
    • http://classicalgardenornaments.com/uplds/file/rawosunuxuzomi.pdf
    • https://clinicscrm.com/img/files/zeduroladugi.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e896c90c70---88315821669.pdf
    • http://sbox-technology.com/upload/datoteke/74685110789.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5e146819---vagibimogadagupeligenirit.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e2922f421e37a8f11c1476ca14cf4ff1/fegolew.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/6bcf4464c5133bbd9b54922de2177e13/39305046098.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6eedbe85---pikajokaxowiwejipafilete.pdf
    • http://pusancard.com/userData/board/file/75656095350.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210607_D381EAC34695E716.pdf
    • http://tamker.hu/userfiles/file/41227455598.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a28043c4f8bc295cf924fcb6886f7793/93952250888.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef4c20802---75550916162.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c378a9dac6---50076358516.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/a40nvr83gurhkc5eu56ddcrsdt/takaw.pdf
    • https://accuratesearch.com/userfiles/file/86705914791.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/qhmftqi5g64a9718dmn3tu488f/bifugizedivowaku.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cd6b709d---75607758483.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c04b48a9---94539703238.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba064a50b0a---82854848271.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d8386a016c31a03b4eb32b67a00edf35/gefoferevevolusubadiworo.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/imcp03e8e3m543rvg32s14btaf/32045749908.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4961213627.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/504b2d5d43547f98a5635abc47451a4f/15656516980.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6a0cf491---68034240359.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reliability+and+validity+types
    • 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_off0000eb3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 16792 bytes
font_01_sfnt_off00010351.bin
fb2268382b3862bb0b6895f54d6b6ea5d57869508941c5e5d187bce57579c5b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10528 bytes
font_02_sfnt_off00011b36.bin
cb601c2c3c74ab6e2a613eb3e51ae9208ad09744a40495c548023d1195f73991
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16720 bytes