Malicious PDF — malware analysis report

Static analysis result for SHA-256 624927ee7562d59c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 21:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7efb3ba6cf41b95be794aa029c8a6417 SHA-1: 7f812a0a969daad764a19a08deaa3016d0424b5b SHA-256: 624927ee7562d59cf1444813e9133bbcb44b1a3ebe043afd93ac7c1e6bc11ca5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download' button lure and the ML classifier's high confidence score, along with ClamAV detection, strongly indicate malicious intent. The sample's structure and URL patterns suggest it is used to redirect users to malicious content or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=jang+e+yamama+in+urdu+pdf PDF link annotation
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/27815564818.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45c6b4919f---fakerapolom.pdfIn PDF document text
    • http://bulmarconsult.com/files/55845977404.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/texekejatuv.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/dasabowegodetit.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/3377419610.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ae0f17a4---ralosumalunagonamurelu.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/47270858249.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9a2468f288e05766e0512126542853e5/69407107001.pdfIn PDF document text
    • http://sun-dr.com/uploads//files/202108070014554741.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dumeravosudidoliwijavi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8dc3c0f8---55792207099.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0306a9b46---vuwitawofofukilanewal.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b65cb04b0---bulevefuwukafidip.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/39465037880.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2d0e732bcad040788f67fa7fa4bc3678/24622996895.pdfIn PDF document text
    • https://dptech.vn/uploads/files/lowowadagipunizanu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/grb3qo1ak9vpvikirct2263d9n/fivisugusekejebez.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/74371483750.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10eed96957---givubus.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/58942043515.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c377b142024---kaxopesa.pdfIn PDF document text
    • http://stylekd.ru/files/sewewege.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea4f4c4734---82203101246.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/vekanirudajebise.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_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 18868 bytes
SHA-256: fd2813176ea9b8b88cf5e5ea63559b66c14e9b786a907af27d2fa0e672cd8d22
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10612 bytes
SHA-256: a7426a7dd76f0e9e5f4d58e09aaa6e4f37a3b10cc773a6eafb82ff9e30ab401d

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