Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe6d141867198a1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 023ad7f6b20320ab0b1f8b1ed4eb124a SHA-1: 177e49c1a29e243af3b1407442491eff74dd60d1 SHA-256: abe6d141867198a130aad37f03af216871a9672726bd0b24c093fd870da75d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the nature of the PDF heuristics point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=como+manipular+a+las+personas+pdf PDF link annotation
    • http://fotografieindex.nl/images/uploads/9100278634.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/33710311375.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/gifolivuvixepef.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/dexoxorove.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/71895762938.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/128cd5a55ea2d68daced305b670a44bc/nawatojokiwebivexowomolig.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210914171209.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/94767162953.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/63370346380.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/jiwugalepevemezut.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zolepajobux.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ttdnrpresvnl0kd3iluqernch7/xexaninurufukajaw.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/zofejamowalomafig.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/59409006168.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/14514571320.pdfIn PDF document text
    • https://mattress-leader.com/media/17531720480.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139919307ff3---nofidagazusorome.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/57852019599.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mevupimulawatuwawor.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/85212468156.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab509e330---dunafewijemoneritaroje.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/26707828480.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/95370377499.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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 10692 bytes
SHA-256: f9a132c88f42bd1d52d71095c5ba532b033367ed8a1176631e1ee3128e06bf42
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 18848 bytes
SHA-256: def2d18513f58987bcd901c7a176d08e4c88b8e2199b09cc954ed94a08260f9d
font_02_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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