Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0880f8d1ef445c…

MALICIOUS

PDF

94.1 KB Created: 2021-06-27 14:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 932e320ae794a5868eb27d998abd4ab1 SHA-1: 76cc459e3b5662e707bd9f450783f04f076d8e7e SHA-256: 3a0880f8d1ef445c1fdd588c447840427941329b863784cd8d03f402e22d272b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rlbuksuce9vq76ad2rel27f66c/dixexibusuzuxorixapidaveg.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a17b7daae---85589664125.pdf
    • http://sy-smile.com/upload/files/66427317227.pdf
    • https://agrilaui.com/userfiles/file/46733828072.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764665ed104---lisiborovuzixo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d193d7fbad33c683f919c2901644ce8/57458823383.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/962882140.pdf
    • http://recrute.fr/files/files/55357715951.pdf
    • http://babamoleskine.com/files/file/3520915824.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/19675998469.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c01006ede64---46556122383.pdf
    • http://learningkey.org/userfiles/52400547940.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d67b1a079---gurajadimotekiz.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3b98c7002d80f86e0e64182e9ec99f83/sinatozaku.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/89752362017.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1295c3f65a2ac3a4c674122dfa4f8997/rapivibojebijasi.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/fekoravukesote.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608182dc7a569---febaxagapuzoluwuv.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad3bb42bf---notugekidume.pdf
    • http://webbuilders.com/files/file/26614662197.pdf
    • http://sanarina.de/ckfinder/userfiles/files/fepomogerawewis.pdf
    • http://rajskiewakacje.pl/userfiles/file/baluzaranipagisixoga.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2aa3025e8f928df961a4e290f3482412/wokigewizowurulutuwo.pdf
    • http://www.almansori-ye.com/almansorifiles/files/xizesalivemabaguxo.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fb1803a1---lelavufesekudeboj.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gfv16qbn6nmgeg69rrvo0uvnl2/logor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+breed+elephants+in+minecraft
    • 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_off00010d76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 16792 bytes
font_01_sfnt_off00012588.bin
fc3114a9bab7b294306f32044c7ecbfaa2f73eb28eae720281c9709c35840c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16800 bytes
font_02_sfnt_off00015159.bin
872259a933257b4c1a105c97b8bfe48218d9d91347bd2ffbfdace29502509078
pdf-font-stream PDF embedded font (sfnt) at offset 0x15159 11104 bytes