Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fd644761740e9c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 19:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92b47186c13fc3247dd7eeec1ed1ad26 SHA-1: c2668dee608f45ac1e30f63dd2f2ac9a05574378 SHA-256: 61fd644761740e9c0efabd5c788dd41360bdf49ec76e179db27671462688f3b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate an attempt to lure users with search engine optimization tactics, likely disguised as a free PDF reader download. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=pdf+reader+free+download+pc PDF link annotation
    • http://staractivecollection.com/resimler/site/files/xawibuvogumonigosag.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210813232102927.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/redulib.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/sajoru.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/30942816605.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/bitimobogegiturosutoxa.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f663630fe---82804138110.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3d6e6a3e---15326968031.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/99315208036.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/57955244358.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/76501169679.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/45701606647.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/tilusepaborulimef.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a8379287d42de18d248723c6b14c55a7/jusowebamulabo.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/3136738421.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/70872350546.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715be35fee7---45395780955.pdfIn PDF document text
    • http://aven.su/userfiles/file/vabolonit.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255a6f290f6---rovipaw.pdfIn PDF document text
    • http://secretinvitation.net/images/files/sadizivaw.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/62419960747.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/bilabupekeketowugupugaf.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8df5b5c84---36481654626.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 10344 bytes
SHA-256: 797d2ad0bde819394759a567750428d937ebe7ba20515c5fd3d44d652ed1aee5
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 17452 bytes
SHA-256: 33694917e44af1131bb8614b9139f59b57bfa87424666cb0a9a8ec36efbc0940

Open this report in the interactive analyzer, or submit your own file for analysis.