Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57e4c51ef8b82b5…

MALICIOUS

PDF

75.4 KB Created: 2021-08-29 17:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44a3d78aafea800cf1f98edcfe63f58f SHA-1: bd5516faf9d2d3796cc6b3bc2b8f4179c65788be SHA-256: d57e4c51ef8b82b5809aefdefe7d74e719b12edf8e5957d29909ea8a9b13ff00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress sites and other disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=how+to+get+super+glue+off+wood
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3a436c73139a72d5aba61f1cd97096c8/vigekipejaposinogaju.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/81834253169.pdf
    • http://szkolka-wiercioch.pl/files/file/41109902597.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54cbab257---wasojewaditusulivuzakeriw.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/gizobinilezigemipanowu.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lipejiwitunutatodano.pdf
    • http://anipetkingdom.com/webroot/img/files/79625413451.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rv3r4f8l5vl7ndkel0mi12mkvr/finajubagubopozivigi.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/25a4qjjne233taigtgijeeomh1/mesovosutowimeworuka.pdf
    • http://gernano.eu/gfx/userfiles/files/gevezujitisemamujazavesud.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/weboginukotuvi.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2dede58284edbb4dd5703fcd4988b7e/pesaloxejawebukesom.pdf
    • https://autotrans911.com/thread/admin/uploads/file/fapelukogewefagonus.pdf
    • https://fanaf.comarticle_ressources/file/37725601833.pdf
    • http://pantryscan.com/123cars/imagefck/file/foruzonubojomu.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/75280348892.pdf
    • http://susutour.com/userfile/file/88729370163.pdf
    • https://ymvii.com/admin/upload/files/11038647081.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gec5t76snljpkgmccrjjv7vv07/raloletojufamijufodavewot.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/witobibatabogedogazo.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_off0000c7c8.bin
d740ace10b2a9741c7aa2fd3b7c55243c4c5d4369dfc483b8a2d3d1e71d0c27a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 15944 bytes
font_01_sfnt_off0000f065.bin
6ac88ed2bb51c01eea6b9fda3644f6da54387a379eed91ed961158ca9a0df0cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10492 bytes
font_02_sfnt_off00010841.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 16792 bytes