Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f2fd6cc2713b1b…

MALICIOUS

PDF

92.1 KB Created: 2021-07-21 05:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f3dc6e8a182a4417528f805ddb3d3e19 SHA-1: c9428a8402311f05d9dbb8b9b478c2d5a34e6b76 SHA-256: 85f2fd6cc2713b1b42521f5b9706fcdcca0a6233c1e43b2892d0571b62dfd05a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079743822a94---gemiven.pdf In PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/jiwewexesutemizawixatup.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/1281520862.pdfIn PDF document text
    • https://nistd.in/userfiles/file/94589084208.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/26375047492.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/mlsng0ltbq55uut9v0a33l2vai/zaxuketotinunefakurinos.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/856f37552af23011a0f0e6214b22b88f/xolobuwebuxevovowevivir.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/dimaved.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac6a5688b---51152635048.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/nowat.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d241882c5c4---24062667167.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/78689685620.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ec65b2b74815f2d5d7f64b62dd10eaa2/dikoberubixaxik.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v6jibsnvjptr2jfcegissfpb7s/fukolekuvamodigelabu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8ac0d098---23394636950.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c916deec2f5---lerikakamawika.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851d9154d51---bobakovebefemoforaboj.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766a4ce3266---fataw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0bb08d77bc173dcd69a8fd9b8a209cac/54596501372.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/tejega.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/72425907415.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/54645139721.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608659db1a50b---85895345841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=subway+surfers+venice+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010e10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E10 17804 bytes
SHA-256: d177d82c429acfc082d255bc7bbe928df7f5c3c89c53ec31b4bb2fec4617c087
font_00_sfnt_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 10952 bytes
SHA-256: 1554574ae4ae4a9b91f97da4cbf37c200f31a9c70a2dc25b32715cbdf40ed9fa
font_02_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963
font_04_sfnt_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 23892 bytes
SHA-256: e3f570b9dd70bfb327960c9157d559c0d355eedf9c11db00463fec468c90136d

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