Malicious PDF — malware analysis report

Static analysis result for SHA-256 1036ca05701603dc…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 08:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66e77844c155d16a605394b7dbfede20 SHA-1: 3c2ec500c8bd844a7a4c3ec955be6d4b5fa0afb8 SHA-256: 1036ca05701603dc1d38a974fd9a6c162b412283c2043964f5d5c405b62412a2
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 domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drisraadentalcenter.com/userfiles/file/zipidudojuk.pdf In PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f9tkrhjqqvnfbeoge97g5699p0/nifofeduraxinutasawawule.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/86002385891.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c5avbit0dokqldppdvrlhkt6n8/vodojigageruf.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da740e3d18---10428331653.pdfIn PDF document text
    • http://accronline.com/userfiles/file/devifuwewenawux.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfda4efbfc---36571688643.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8583934fa---51049632498.pdfIn PDF document text
    • https://melz-feu.ru/upload/kawisorikajubi.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/magobikof.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/sinotevinujuz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5c72ce9cf5d6d20c943a80da8d2cd6d1/makeda.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/keruwelufalepebesavute.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/wuxelada.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/578778f394c53666ca534ceb75bd5f17/25449801754.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wegugatotikizol.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xagiravegofevewajurozaged.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/akq0nos9jlvjthkg4e9da159nl/65464957020.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108210020493321.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/98200704446.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a99efa2c77a---gizuxedejufop.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/70155720919.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/49097452ccd57b333241730af36172b8/sutinoguxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=speed+velocity+and+acceleration+worksheet+igcsePDF 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_off0000bd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD34 11224 bytes
SHA-256: 6caa069ec172f7b11c7b2b5065c3414f55e5b32c1bb0438fa51b05c5b561b903
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 17320 bytes
SHA-256: bd0acaf4a5b87a053a03b813997a99c2f881eb4cecda8c69babbe2852084bcb0
font_02_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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