Malicious PDF — malware analysis report

Static analysis result for SHA-256 86719718483b2c86…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 16:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 770be8ba33bce126c8ed461ae9bd05d6 SHA-1: 2fd453a02a64a683d972719366c3ec381ae10c33 SHA-256: 86719718483b2c861271eb52807cedc70eedc9e1a7cb1c24d08094f4e80516a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, directing users to download potentially malicious files from compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely provides instructions to decrypt an archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=wwe+2k20+for+android+apk+download PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160988af012df6---20508444738.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c42079c5---xorakizojudinexuloxizow.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e9f725a5---24134830723.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/66033588009.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vph1080onikcjktg4984p1ccvb/zedokerogezuwalevuvexitiv.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7aa29cc95---bugatemepadudus.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/57828487810.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/32672642285.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/36869025689.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/87682067459.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/30188c94e734d9b084abc3cb09d010c1/lelefutepewib.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/6476850810.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/wefurevu.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/69191226429.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074907add088---8551933901.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/97402781554.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/petefugizegopusikopinigox.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/potalagibegokopi.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/nuguramimexot.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9553a73f4ccf82c0aee4f967e50be723/35625065103.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cfch3grevsupvj467g9hm28h34/77148758582.pdfIn PDF document text
    • http://charivne.info/images/file/gopefunadedirotuzubin.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/87254e728f8ce432201c7174ecc92c01/naworuwukipupifafeta.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/39d5cce75178ac7ac56cdfafa14d995f/sepadu.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e69f2faddb0a005fddbc42da26b03c2c/89499068770.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10636 bytes
SHA-256: 942478e2b38e4f807c675f9d1c9bf74e5e12fc8e20c19a833b5b5b2eedac73d9
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 20324 bytes
SHA-256: 56c9993f976325a7a8be50bd326f8b81d3dab71c045f20cc9c0ca6d9f7a3ec31

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