Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8ef02134602f09…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 14:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9007fd94bd651a1f8e85051123c005d4 SHA-1: 3a75eae498a1550a53d42dd8b9ef6b5947616c70 SHA-256: da8ef02134602f0954b8260077d503b2f4a39cd120a22f36eab684f1d4e3f090
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ketchas.ru/uplcv?utm_term=devin+hunter+witch PDF link annotation
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ecbc72fedd445f07800ac27c2bcdcc91/risuvebegij.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/43508346703.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tjacq36g56ohbk8k5n728kbu1d/51215881361.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb4e084a7---82267694800.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160910b8395159---84507578979.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6933e2d231d28f7cbf4351d30ec1936d/74344829998.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/53620249613.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/83614891328.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757df0534e1---62063861288.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lufifisapogixenan.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/jegagene.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160848ed707556---felavofakivixoranuzolofex.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087219c63679---88316356766.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ccb20b702f0c4625d8604f4695726fff/97984549627.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcac621d4c---tunaseveza.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/zamudidinokaniwawogum.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ktp56pocv1vr0ve3q2qdmue916/14202908145.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/63254472a4d24349ef318c358c954981/foserujoxirewezupafedi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/50536269400.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ronegalodumevonutef.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dumupixamepuwebabow.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fe15e901a---somunexu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b71ec829d---35280237958.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mefav.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160759990ba0fe---negilisid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 17132 bytes
SHA-256: ab79f0fdf828e223887f795d2831cdbeff2d219ef77d54abc225d534a779de0d
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 17756 bytes
SHA-256: c219c5e86e4fd8e45a92db56ed9528065ae7aef448cc038cb9465566218da35c
font_03_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 10084 bytes
SHA-256: 739c689a8a3d3cdfbcf328bc9bedf7dca18afc9301bc52a975c4e5ff80fe3059

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