Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad005f4c15632b24…

MALICIOUS

PDF

89.7 KB Created: 2021-07-01 13:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb7d0205e0f83ef118d0357d90ba6ad8 SHA-1: dd6db955e4211cb1a9a130baa1fc8b9e6f8c66b3 SHA-256: ad005f4c15632b243d569fb7d666fde86bc59d3fb25a9c754771885006019318
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised CMS upload storage and disposable domains. The presence of numerous links suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unosms.us/userfiles/file/ripalidaridobakexowalu.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712cd5983d2---nafetetosapexigez.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/80d0ee0317d939264cb438282c0fb4c6/91689004848.pdf
    • http://scheiden-maassluis.nl/uploads//file/19617802340.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c37a0ac9---rugatefelorub.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8ddac11308fb514fefb8eba0b14d852f/56757654781.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0d91832cbe59009f24de7cb177ab4da7/bemejumasuruxi.pdf
    • https://mimpishio2.net/contents//files/gepokixaxuzalojevumiguge.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4ebbce0e---fujilevofuxibofutesi.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/553dc24192f21528a8075113e4b924f9/33211774906.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c36187d0829---77731569405.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fe8740a2---tezavegulom.pdf
    • http://dobrasekacka.cz/userfiles/file/14575642466.pdf
    • http://beergolfers.com./blog/images/file/12307481423.pdf
    • http://barcabianca.eu/upload/file/wumereliju.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4be24ab0c5ac9ea87d1b4337c7d977f3/82268285039.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/op4q2fh80f3996s6btb2e85rvb/56265692268.pdf
    • https://lecapsuledigian.it/file/96314832636.pdf
    • http://cana.vn/uploads/userfiles/file/giwutofatedofusu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c6a89196---bekixiw.pdf
    • http://challendor.com/fckeditor/upload/file/dotani.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jack+the+giant+killer+movie+download
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0942cf0a518eba61187ffa77ab90c188/lozefefid.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_off0000fd2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 16792 bytes
font_01_sfnt_off00011544.bin
bb40aea189e9abd0ab9261b662c46a4dfbca0476b49c0182b7557ce6dde8a458
pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 10884 bytes
font_02_sfnt_off00012e1b.bin
dadf52fb57157551707df446df30c34ecb282e27578bc9122ca397961b2af142
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16812 bytes