Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2451810508b3690…

MALICIOUS

PDF

100.9 KB Created: 2021-06-27 00:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2df802fd7c10e974660b37c01c27bdc7 SHA-1: 7a9bc9af117181e8ce0ea9760972f0a0dd0cea8d SHA-256: a2451810508b3690b84ce763984d3e657dcc64e2bc8bd39f4cf2aa41cbd483d0
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The heuristics indicate it functions as a link farm pointing to compromised WordPress uploads and disposable hosting, likely for an advance-fee scam. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://archism.ru/uplcv?utm_term=good+excuses+to+get+out+of+work
    • https://inverpalmas.com/aym_image/files/tezufimegozuxu.pdf
    • http://malopolskiszlakwinny.pl/upload/File/bozopu.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608100c5f1125---99737461494.pdf
    • https://aashianarealty.com/file/sobemitalawul.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0ebaaa83c3abca354f54749e66516992/xafogudevixi.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/53ummo82f2gqsamu7g9i6ub6s4/30759677446.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/g4i228kicg2hhtnhllrnbadtsv/rofowidofuvozivasi.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12580afd2f---xotopigebeku.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0c10828120139ccf01a29ad250ff27e9/nonogefulut.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e45c4b59e32a79419118f5666b49152e/fijazubulijiduside.pdf
    • http://itkaufmann.com/images/fckimages/file/3157181539.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dfmt5tt01ulghcnq9qdnjg0p45/1762526649.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a0d4f7cabfe051ee1794ac77d1a41dc/35728504844.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72cf6edd5---74746578816.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7df61de2---62600497237.pdf
    • http://jarosi.hu/files/file/lijetizi.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3b60iqufp7emfesvt1t2haoap1/23440611384.pdf
    • https://asthasupermarket.com/userfiles/file/37846399662.pdf
    • http://grimastone.ru/files/6699703693.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7ea8b49c---nodirujowadorigojev.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608417ec4a88c---dozuliwizujusu.pdf
    • https://cakesandcupcakes.net/userfiles/files/53225805610.pdf
    • http://conblocmanado.com/pics/file/63294474547.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bcb.bin
e1f3dfe03885f3efb79a3155aa4fbbddf10b020127f980048721b731fa305e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10668 bytes
font_01_sfnt_off00013455.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13455 16792 bytes
font_02_sfnt_off00014c62.bin
44b0f52db7314115127d8c98708714d01602f65d7ec6abbeb281e5013f1f28c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C62 2372 bytes
font_03_sfnt_off000156d1.bin
4ce891113cf925ce1b52a66527a1fe93c3e2f9c6a144cdd71f668512e5dd3637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156D1 17964 bytes

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