Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ef3829f496639d…

MALICIOUS

PDF

97.4 KB Created: 2021-07-14 00:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ae5904d1eda4cd057233d36d6b49c15 SHA-1: 0ad1b0dcbc55003703ca995459db6c172c5a303a SHA-256: 93ef3829f496639d6e0713a4ef67d6b6759fbfd3eab2690014545fdf709dac65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nomylo.ru/uplcv?utm_term=not+happy+with
    • https://palcev.ru/userfiles/file/20814059175.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2ae6bbbc---81350439326.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6afdb6a35edb220ccc6fecb988c5e88d/38177661075.pdf
    • https://aplusadvance.com/naver_editor/data/file/dixanapineverad.pdf
    • https://dianthusindustrial.com/resimler/files/72089432982.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/rigiroruvezosasom.pdf
    • http://rideabikenews.com/user_img/files/89204300045.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/21k5qaf8g8ee7dgi842kb1ah6p/kanepob.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/95997436018.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vcaj1qs80ug2i9g8ib826tk5g2/rapuv.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/853080f73b8fb6163eccda08ad2fd9a2/35776782064.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/tabusolinimifibolig.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c32474144d8---81361733205.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/c491dsmk7g33p1j0um22gv1o92/89494698810.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f1bd47bd---82175172755.pdf
    • http://beiwendq.com//data/attachment/file/46204699498.pdf
    • http://thunderstar.cn/userfiles/file/20210625213729637140487.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68f49fcce---925660954.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aeed39825---kiruniwedodifepopikur.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/23084298823.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/d3gl9vu20ao2h9re055s8nesru/revekosuriwi.pdf
    • https://istocdukkan.com/userfiles/files/43593694600.pdf
    • 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_off00011def.bin
d410ced0fa4a4161c9b2da774556cce1abce716a05b22ef25907208eb1a25de1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 9976 bytes
font_01_sfnt_off0001343b.bin
23f588d2959295c7473c23f310a3186390c020218b9c226fee7ee900d5a10d85
pdf-font-stream PDF embedded font (sfnt) at offset 0x1343B 17068 bytes
font_02_sfnt_off000160a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160A7 16792 bytes