Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09e1a1c6fa3ec57…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 08:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0485294d4c382ef9e5d91ae12ef5d35 SHA-1: ef525cf29083b01476b80f0965f8a6fe21f2fb21 SHA-256: a09e1a1c6fa3ec576e6624e56ca5567e3dc5281f0e84f5445c1f0562e4ec34a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and does not provide direct clues, but the presence of a link farm on compromised infrastructure is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f51d30e6---josarodemazumok.pdf In PDF document text
    • http://turagent007.ru/userfiles/file/jipopevisuperivu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/05182cc97e4fbe3360a694ffd823de1a/72672886114.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0682ab3aef---97219286758.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b748c6a2---48226067697.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/do42rs6mtlht9kpfujbp5ijhjl/7240071806.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2231f506a3470ac13be1e65dafc4e31a/45806210132.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd859718ac---zopawefukafesegekika.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tesazo.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/14167492200.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/78986763231.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gakepadolufirefo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c8596508---48130684798.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/de56546f95ceff9da055e20dbd4f23d3/bebotatidape.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa301de29---40755170124.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210722_9882510D5F2F2BE2.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4e8ucv7sf0nlcrjjcl8ctl0oma/robazodefutukagaxoxamegup.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9034b1fc---78240870237.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9d06s9irc78j5jk1gocsabgbli/tedunitutini.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/15201786898.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098798f6322c---94297638052.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd6483461---kixegenanozemuleniru.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/56242650403.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b311679280---46695910655.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/govilabumadaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=arithmetic+and+geometric+sequences+word+problems+with+answers+pdfPDF 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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 11520 bytes
SHA-256: bdf689cd5f06f15c49fc279918aa58787497e1455b7c5990c47b744f175e2a04
font_02_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 17864 bytes
SHA-256: d0e33122918ccb66c843ecef9a0b010a39573a52dd4791c572709eeb7649af57

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