Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b72f5375288bd85…

MALICIOUS

PDF

86.6 KB Created: 2021-07-13 21:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 51b93fc106ec0177fce5288e93cbeaf2 SHA-1: 25fc051c0886cc941fac55d401ba7739a03bd8d3 SHA-256: 7b72f5375288bd85998043e4d50c909529889262ef1fdc7a420bf36c723ded5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20b69d9266---83161367098.pdf In PDF document text
    • https://p99.tw/pro_pic/files/25691628810.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3e0aec9d---rajikop.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e1be70abd---48573142378.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/senufaruviw.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/33882002102.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a698264c6c4---87902280694.pdfIn PDF document text
    • https://invest.pl/userfiles/file/86763459154.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3fe4815d4a32c278808666120663a9f7/dabenawupixukovigozixu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/66791362791.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/9tfp0v54l3n7cp2vob7h20jen6/zokisazeletekolizufusik.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e329b994610---fevadisa.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l785o28okkmdekh637ll1dgua5/82203448461.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ce9d26fc01ae748d885de3a5e5f774a8/labuloduvopafizozewapowel.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1rkmndrteomobcsvdf6774var4/kejirofomufafulubotil.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/77be240a937d8ea27baa4aa732d4aad9/82367034735.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4b778ca0---33968355896.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5da9abe28---kejigiwupotibezejolediz.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/55793829643.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43126c4c0---5370205590.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/rozekezefazazalopilebig.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c0dbbde---45811803569.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608210932cd19---dikoxutasarukazisomolesu.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/ganagoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kind+of+music+notePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10420 bytes
SHA-256: 3d1b73e5a802cb55d2e1a8690bbc790022dd0ee1e1b1abe0b95ee5d497c6ff8f
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 17688 bytes
SHA-256: eb7065a22048aa67145c8da60f92a6b71d1f0a0d5352dc91434d04329a64fc22