Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf1fa002d5d3c3d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 21:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d40a7b63ca27e68631a308693ab6977a SHA-1: ff1e15fb2765457ac077e5066a272c72999ea648 SHA-256: 6bf1fa002d5d3c3dd1428fc6bd0f1d0e33a4b192757d067a8d55c968428e5521
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to lure users to malicious sites, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ibeguiristain.com/userfiles/files/tajonovokip.pdf In PDF document text
    • http://mottaing.eu/userfiles/files/gazezed.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/nozabajabevowovufitot.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a2f4977ab4cd2222c482d98f059f48fa/19432111834.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/xiwerogozuluji.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/xubokulekim.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/798f658143fb50af0de3325ee03e7bdc/88383074825.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/vawufipekumabuzuwukegu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/bubukiwatuso.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/adc8e2cab28b95c867c6f94ae3916d89/61960462198.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/sbde3kv50uqjfs1p61gc5b9nec/petotuvopuzu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m7tihbtk9hafhieg73dvhq08go/22675334070.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/rolidovuxutajaxomelunos.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kaxazup.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/wivumomitevanejemosuv.pdfIn PDF document text
    • https://fratellifurloni.it/file/papomovozomes.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/130710478246.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/savona.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/tijem.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/29052528201.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/zedalofo.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210913125323.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sonupisexanigo.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/zijidegevalame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=camille+paglia+provocations+pdfPDF 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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 17872 bytes
SHA-256: d44bc92799df43fe1c30c9af03262d995a157af0e60568c9c9cff8d568a5130e
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 11060 bytes
SHA-256: 0ff719d10af8c12b67fb8c0eab28b829ecc3fc7df46316fc34bfde41debd5cc7

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