Malicious PDF — malware analysis report

Static analysis result for SHA-256 31957e0d26f21510…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 10:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75be2ddca0e4578c6a439fad92b1d8d4 SHA-1: bbdb044c9a51b7dcf4692f0ef217825e7acd9c82 SHA-256: 31957e0d26f21510a9da187f93e23e927d898d2bad73d897fe41e489d8448208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oniceh.ru/uplcv?utm_term=deadpool+full+length+movie PDF link annotation
    • http://kimyasaldubeller.com/upload/ckfinder/files/lasimosagibu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/faseviwufib.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/82192901563.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/lavuwebafewoguvilutuxew.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/bezabevarom.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_2CD079FF8205F0DC.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/23951623012.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130baaf1fb43---garikanej.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132195446c78---desurifemojukekobumevesu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fff39c4cd08ee43e7c173733878da02a/82905476304.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/difufavaniv.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161361ed218ef0---pimikiruzi.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/rezatuferipon.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b89255df470b081e3b0da7069914ea53/filomikikulurirovebara.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cddcabd2b14349db55c5e38fcd82dbc4/43503366417.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/kokusosonezo.pdfIn PDF document text
    • http://zzquansu.cn/d/files/33821486915.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dexuvelu.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nejovaluzudogakusavo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb53848e---larixutojuberaxolipupe.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/vopixubekajuzutezozofos.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecce3d738---jumufoj.pdfIn PDF document text
    • http://swhos.com/upload/files/31372633613.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/daperokerutonefiripa.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/foguruvaguxux.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/tobagakodipivepunikegubar.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/72025191480.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 17548 bytes
SHA-256: ec7d8bd84562a239286ac43802928ffed80c2a3b12d83e4a92c242d52a8fc3f3
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10844 bytes
SHA-256: 29cf385289272b24ac70443968bc2dbc31597c7ae8e020f0f67ab3c54bde5987
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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