Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80aafa72aa973fb…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 19:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 38d6935e8c6f7ee156ffe1a480693703 SHA-1: d0a0a8b643e33885b8b465de5bade0a3b0670cb6 SHA-256: b80aafa72aa973fbc0a627ca70f67c7267832d01c51ae93cbe4fa9dd76dfd6b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm on disposable hosting further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=football+matches+today PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd07280ba6---benazojunerojavawo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d181bc4efb---1124216412.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1132e8bc2a2b2cb2ce7861ed822ee45c/bejisepezorutigunorigo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d303fb9508---xavesiganevalibu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760f1990d57---56342937273.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1fe9def7ac14bf41d6b229bca5dbd963/79700552849.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7nhq822hrvldmhheqti51pqbtc/wixobinazatuzirupek.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4c88db8466b65ff6c66966e05c63cdce/zesavebafofuroxili.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab45261d08---sujiwipafefizufol.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5bf61c3718a90de95a8858f48d8240b8/didudigan.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/40mb9frsbf8pmto5ktfpaqvu8c/35852544947.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/fituzovu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kepowujiwafuz.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/61069469123.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942234f3feb---83537382609.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/mezizabaraximuxixoxezef.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sapuwow.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210627232103_tsg371.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ba648d81---legapebosabej.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a779aa812cc---48515103163.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/73547955102.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/87414040071.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/tukanokutivofofiwumiza.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vuwenuzofodatoxotize.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/rku3nrjktd5nrkprrahe98q7h3/30571583346.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a931b317cb0---xadogiv.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_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 17924 bytes
SHA-256: 6b3e9b8261216d01d4dc419006cd556d53d00d97e7d82b7e44f0b255f034b5f3
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 10568 bytes
SHA-256: 35c0f4793c76288740811062c14e7d376e5c0c7598cb0d63ba1769942a0f5424
font_02_sfnt_off00013e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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