Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b9cc077adc4f1b…

MALICIOUS

PDF

115.2 KB Created: 2021-07-03 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed470f4a9bb0db99658fcd01655dfb02 SHA-1: c5cce75795f496c9a6df7a65e30048f92ef8021b SHA-256: 54b9cc077adc4f1b28a89ba4b4be758a0987ca7af8b19e929d10b5f0890f74ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting it's part of a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics further supports this, indicating an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3f543b54---bovotabedonit.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d9be846e0---tavekodimas.pdf
    • https://krassimirtaskov.com/userfiles/files/9435492769.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4fed48967931e2a2b460fcdebe28514b/godofufunomufawaneguka.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec06dccd6---vetimosemepisevukes.pdf
    • https://uleiuri.ro/userfiles/file/75370022695.pdf
    • https://paperland.bg/uploads/file/guwujiwunokak.pdf
    • http://aite-materials.com/upfiles/file/2990494186.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ebf0b30f66006c36d31c9798c209e422/jilavusobugig.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6d3f57ef6d0fdf1528887f52c091fe56/32972790191.pdf
    • http://cioccolatogallucci.it/userfiles/file/17868683736.pdf
    • https://icbacademy.com/upload/files/sofokumijifokofu.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e3a46b63---49662127342.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/274524573f3c6b78175bd0ad0e50187f/3294448763.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/2b19hm1il5h73q5232gqbkh73s/99298367583.pdf
    • http://kalikraft.com/images/file/lukawopitumu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf49c8bf9.pdf
    • https://andrejc.si/files/file/jugoguzu.pdf
    • http://bycongroup.com/UserFiles/file/33432304773.pdf
    • https://ddshower.com/ckfinder/userfiles/files/kuwenazogakexe.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/4000474155.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rvojkca2etg7hk426ueuavsvc1/41313463002.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/28904784247.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5f14bfa8---nerusedafaku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+graveyard+book+free+read
    • 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_off0001601e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1601E 16792 bytes
font_01_sfnt_off00017835.bin
119432db926c5b3a29e1be292a73c070fad2ebbebffab51f483b01a4792c1562
pdf-font-stream PDF embedded font (sfnt) at offset 0x17835 10500 bytes
font_02_sfnt_off00019004.bin
868a4845fe8bb1e14c4130f420a441440b3cb81cec4b0122a0346e6abb00a50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x19004 17896 bytes