Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a482e350ad01600…

MALICIOUS

PDF

163.0 KB Created: 2021-06-26 06:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc4dc9f42566af4e243f25c3ac1c68a5 SHA-1: 29941acbc20caf642f8dd3c74c109ce6bf61699f SHA-256: 1a482e350ad01600303e2cb2a137bdeef39072b5de715b2720caa428d1ce0c99
96 Risk Score

Malware Insights

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

The ML classifier and PDF link farm heuristics indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple distinct hosts and link farms suggests a coordinated effort to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9690

Heuristics 5

  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096837fdab90---38404465995.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/169670b591dd7534c9cdc415762e7cef/fowiwejiw.pdf
    • https://altonika.pro/files/fck/file/fisulutusuzidadusi.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/v170o1t1pv2fcholbldu1k2s1p/posajizudejazanisak.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e07eee7f---28949015445.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160788bffc9c87---8062185157.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/xewaxabol.pdf
    • https://peilimineko.com/userfiles/file/21451656180.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b846ca9cc3e---fuwafudujovozotodojoruto.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/754b53dfc4ba3f4a799e66a4db68d45b/pazir.pdf
    • http://visusmarble.com/images_upload/files/tozujasaweduxovijomuzaras.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/17426724507.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210529_8321C47C91E9BE6E.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdcf80838---tujutegewesetuf.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e9882cd---nosuxu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff22347ffe---notuwurejevopesuso.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f55f2a79b25fac794b495645a5071842/nivanu.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e591049593e6aff08f0bbc55dd540e89/49153492224.pdf
    • http://kozelskadm.ru/files/uploads/files/vakopobasudazijabet.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/in85dajh0ecbadono6m0qdl91o/8987791154.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/85rajq5k5u1mbb8h61tpsuh4be/19089901501.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a8a55a5fe59b03b1730ce25da1dff7e3/gunezawisa.pdf
    • http://tz5168.com/uploadfile/image/2021/06/25/file/20210625_025419_191.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56bcf60517520dae949fa34084717f18/39635936822.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=there+appears+to+be
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ad.bin
073f61e574a469a05937493f07cdfe77fb38179c3e26fdc53876355f6bff379e
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16740 bytes
font_01_sfnt_off00012d2f.bin
c84990b6103ac4a83eb408e2d7861ece0d366e9b13d368fadb790766dd50a564
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 117596 bytes
font_02_sfnt_off00024f58.bin
a2a19693daebdb20f70b118d96f7ff29e85cf893b8ef9e74b931cd4451ad614d
pdf-font-stream PDF embedded font (sfnt) at offset 0x24F58 10212 bytes
font_03_sfnt_off0002662f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2662F 16792 bytes