Malicious PDF — malware analysis report

Static analysis result for SHA-256 4574fbf2eae755c5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 14:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d19d7df30658e2ec883c734319ad42be SHA-1: 912178367035778451225272430a38173b832b51 SHA-256: 4574fbf2eae755c52d164eeba55fd41e0c4e0527aca49126a45af5853d7545ad
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive recovery information, likely to facilitate account takeover or financial fraud. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://queure.ru/uplcv?utm_term=chinese+remainder+theorem+in+cryptography+pdf PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8eb11586---vawewowamuzalumelipa.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/detidetixosesepozuv.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/eg8rg63j6gpkvodd57acp36tn2/rumuviwozaroger.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad50825479---41977275182.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/94977705456.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f969d5e8b3f93edcee4ab8a9230132cc/xasitiburodo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944743cbf3c---vefabuxolimoladoxixod.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc5bb906c---dowalexirati.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3795e718c---pupetunonodek.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/tetituxeborewupo.pdfIn PDF document text
    • https://aspirans.com/files/file/46220311918.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/83362897587.pdfIn PDF document text
    • https://kermanrooz.com/img/files/18048527608.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/52429383272.pdfIn PDF document text
    • https://kaimano.it/file/bavina.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429212437703453.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fu3b7o68hp5lje1b9877sf537q/kabilesozoputezatusakuza.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0onl7aua8mlqpegqv2jqdbfio7/3393529411.pdfIn PDF document text
    • http://innotack.com/userfiles/file/42836698584.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/43298094072.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/dugobufafamojiwotom.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/12642051360.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8baf359fb2---jotozexi.pdfIn PDF document text
    • http://medrea.ru/upload/files/21549382092.pdfIn PDF document text
    • http://bdn10.cz/files/file/45899650339.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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16016 bytes
SHA-256: 3123fe66a30f55174c43e5de8c801817c0dc57327c6a8f9c2445c7d7dc764dee
font_01_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 11164 bytes
SHA-256: fd6e951746deba77e7f96857c1d1e4b4d4cf6d95cfb3d399ff083faa19a2c840
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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