Malicious PDF — malware analysis report

Static analysis result for SHA-256 23af77675c7c2f6e…

MALICIOUS

PDF

75.7 KB Created: 2021-08-28 00:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f03a9a4077fff4becfb83472c0bcd152 SHA-1: 4a1e1b731b3a0048749cb0f874505c2ad65e72e1 SHA-256: 23af77675c7c2f6efa18d710759f5903aa1417e57f4737d5dd451ca93d1b6134
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit users via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://questyme.com/userfiles/file/tarazolojada.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e4075774815c3dc2e2260848eb286ff3/movosolezomuwitawe.pdfIn PDF document text
    • http://houselandia.ru/files/fedadijamexosafupejowof.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b75ed677c665daf2d68d3ac7995debf9/borogudodokef.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a57ca37c5be69b2b6beeb18220a3bc10/pawefadikidililu.pdfIn PDF document text
    • https://irantruck.ir/data/file/wubetedelilane.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480aeb3cf8---21466087166.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/temejidibe.pdfIn PDF document text
    • http://c-amc.com/upload/files/xajexidawekonevodugaludu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160830c0ea7d66---xesasubolifovipapalelesov.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bamitu.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/98502441597.pdfIn PDF document text
    • http://cga82.com/admin/File/71598443911.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/zapateg.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/nilobilevowes.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/lakagapumaraxidu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078804f836aa---welule.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/8972116850.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ed4e8cc36a9632436121f7ffa5a58d7e/babikababumesurukaro.pdfIn PDF document text
    • http://rrarental.org/upload/file/11475256276.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ddc93766a4812da760a578b26460ebe9/xodefudoruv.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/64562139725.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e06badfc3---33087597863.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/36941625582.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/metariliturolix.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmftt3epenh332r4pcgcoebv13/49246761262.pdfIn PDF document text
    • http://pi-consulting.ch/download/39063929477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+is+one+and+one+is+allPDF link annotation
    • 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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 18012 bytes
SHA-256: 4dee0f88f22814e14baaaec667eb94112c9db4cbfcb69de5496bf9073305192b
font_02_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 10024 bytes
SHA-256: 87069f8aaf9edd8b2388b1be523e8aebd9d0f02cdf174e2e98b994937a4517ec