Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1925436fc65b920…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 14:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de7b461c92cb33d0c8298a26cd1e33ae SHA-1: 7cff02c3242578842787237db07a7bb393461af6 SHA-256: a1925436fc65b92085315a9bef04a314cad04e391a557353093bb76792aff857
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads or visiting malicious sites. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ajansnigde.com/resimler/files/vapomuwir.pdf
    • http://www.scsk12.org/policy/files/files/61432117775.pdf
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/kaxepajodi.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b706c377c1f16ed78a50f66aff14a58c/75718079274.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/94968700821.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614afb7f59c9f---lizeninedazabubawi.pdf
    • http://magogaralbamoble.com/galeria/files/76694953658.pdf
    • http://polipadel.com/userfiles/file/44213172540.pdf
    • http://se-ty.com/uploads/userfiles/file/tafujevewiwugupadof.pdf
    • http://dienvietbac.com/uploads/files/34015668473.pdf
    • http://art-lan.ru/uploads/assets/file/62884680481.pdf
    • http://eamenfaraz.com/cache/fck_files/file/405731896.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/wabak.pdf
    • http://thailaundry.com/imgUpload/files/mutisanofutoxi.pdf
    • http://tpfish.com.taipei/archive/upload/files/visosiwowowiboka.pdf
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/31807793549.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/52019892523.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/jikuguwapifororajikobeso.pdf
    • https://lingchuanfloor.com/app/webroot/userfiles/files/72726367909.pdf
    • https://foursservices.com/nbloom/fckuploads/file/5106844998.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e86c622992c01efac1bc87e6f2164f81/pawofegafevujepuko.pdf
    • http://mueblesdepladur.es/1/userfiles/file/62470600298.pdf
    • http://myshopgroup.com/userfiles/files/donevemizotigin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+hitman+mod+apk
    • 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_off0000b2d0.bin
64f53ab6e678eb3aa367a33dd315e8095286b175a8756804bba7210a7bb3c2eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 18016 bytes
font_01_sfnt_off0000e0f8.bin
b20ff1a1a639ad193569a77c12e0687261849508411a8543a29c2551bbb49b03
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10436 bytes
font_02_sfnt_off0000f863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes