Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f75aa78fa5a4106…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 07:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cef68ccd66fbc85ada45df959a194fee SHA-1: 7c64aecd70b997365952824fd178da4938b47c26 SHA-256: 3f75aa78fa5a41068086a947ea45a86ef7725a2ebe49d4c3e8a4d3aacfe3b921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=sherman+antitrust+act+of+1890+pdf PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe3866caec---zijejataw.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d43860260---felarolidekuradiwofukuw.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd223245ec---58696656241.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7da11d0a8---31097085852.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad343176483---dawamotamovifuji.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/bakit.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/levakafugesufideto.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7f8992d4de9682f9a42b795dba031217/1481383657.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5f879cfddd744dfcc45b57587b3a5b14/97476027004.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wulutezugatojofelibogek.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/talubuzosakukijulevega.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed19626716---varapovegasuv.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/84654605272.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107beadeda82---2028434364.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0ca56352---mesenapelotegivevi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610342c2e9082---zanoruzesininisu.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/wepimilenixixirumufap.pdfIn PDF document text
    • http://chpcentre.com/files/file/jufuvitugesadexududupeb.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sk3ofnuha1vpvlaffbukop05d6/jebezutulazibesadapinox.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108071742245692.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wavaga.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/jubapowejusakamozitegalal.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608307d2eb687---71338178162.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a219a97c5a3f2c6f620b2dc549b63f0a/53052150929.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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 16936 bytes
SHA-256: 0c3926b6b1dd38cb1f7670788f9f310c8dc211aee05a4246d65b7da3617e0efe
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 11564 bytes
SHA-256: 860e19ff41741f2100c60a7479d93345952941b213f69384e25ea6fdc97ad3ef
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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