Malicious PDF — malware analysis report

Static analysis result for SHA-256 4298e43442887ef7…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 06:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61f9c5a07110669f54ef7be5fbc59588 SHA-1: 45bb3558c6fd624619445f0b7e1b4089e9fe90ff SHA-256: 4298e43442887ef71b7577e2ad95532a3d212332c561e4c9873b4f82de26e912
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a499de8f---vupaburavekokurariz.pdf
    • http://e-hane.com/files/rorudoxedebobupiw.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090900117656---bitateg.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/dc353f02babb95eaecb394aaa8454960/76970651183.pdf
    • https://alteanetworks.fr/img/file/medebud.pdf
    • http://thepnguyentran.com/media/ftp/file/tadefebos.pdf
    • https://egokituz.org/files/galeria/files/josimegifirev.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3240d8a4---getepunexusimapapeseb.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/91pove2mplvg340eg20363org2/pudetometiluxadalun.pdf
    • http://446888.top/userfiles/file/7200216698.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/12192a5b57f9b1300564bd62653c43b3/mifajanafo.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/32c09f7a3d970483a2b36b619511f82c/jevujawigaroxebitikul.pdf
    • http://yesilderecine.com/admin/editor_resim/file/rirabifusanamubaz.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f256de9---kodubub.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2c625994---21597729830.pdf
    • https://giolog.biz/images/bulk_images/files/32265762360.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/nkr75ujpi2jme5no8btmssa50c/3804361403.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff47d8490b---30677960270.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8b676eca---7686307318.pdf
    • http://fygl.net/uploads/file/122012448603.pdf
    • https://argumentua.com/i/file/69995656094.pdf
    • https://tosto.cl/ckfinder/userfiles/files/mozilivum.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fd978e66a8e2f81d53b8fabe1769b506/junebeliketuzi.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bb8398d0b5e2332d4b9a40000e0443ef/bejozez.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/24976d5738cc3c258bdd23bb1af62477/futol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=reading+comprehension+for+7th+grade
    • 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_off0000f180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 16792 bytes
font_01_sfnt_off00010997.bin
1036c9494037998dde974e465f19e0472267ea6a8a747dcaa6d22229cfaebc28
pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 11116 bytes
font_02_sfnt_off0001231f.bin
a2b66cada9990fac86cfa4721f61662ed880c46c039b45e4fb04780e92253c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 17308 bytes