Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f806c4de5957af2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 04:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4610529bfdadc0bbfccd495fef35d0a4 SHA-1: daa033ed494a940a901ead4218c132c9c5a9af46 SHA-256: 8f806c4de5957af2bd5dbf17f022f63d0744f98dc2b432adeffbb3cafb0820d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to other malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=imaginefx+magazine+pdf+free+download PDF link annotation
    • http://kursadowicz.pl/Upload/file/puzukuxiratavabo.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/fixebujaxetijegokafamisex.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/3365765577.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/91790540881.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zidijik.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vezuwenezuj.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/xunokivugosowesodezube.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/75669870607.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/runoboberejunasixabuvuvat.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/60582258498.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/47302468586.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/881ef87cf4bdfe9184fa35157ecad2e6/vukok.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/30569549376.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d3f9da395ee96a72ffdbb9b56516922/1181796424.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/wasugil.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/3257913745.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/0be04534ba8abd9ca8ecd4fd8e16d111/tumesetidutupazigulip.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/64862714994.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6d703306fe88b009a638e38902e70ebb/39795002921.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/90258139830.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kimutodademunujeto.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/botufifiribax.pdfIn PDF document text
    • http://poliinc.com/upload/files/vumoxelamegiku.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/61647439194.pdfIn PDF document text
    • http://pvvc.cz/files/batopavoseralezowipomena.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_off0000b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A0 10776 bytes
SHA-256: 75f07c70f110f2d6883ec3099c0739d1e58413fdbbe1dac312a4cb63d18963c5
font_02_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 15372 bytes
SHA-256: af8417d5ee7d8146b8ae1585aaf959f19126fd86ec13cf7d1663893ae901cc1f