Malicious PDF — malware analysis report

Static analysis result for SHA-256 2296f00766d9be4e…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 09:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50969800c1cb2734be938214127649b9 SHA-1: 936f3f81d7568959b739735694da1a7034669d40 SHA-256: 2296f00766d9be4e8c6d1309382d040c0d86d8009c461c78b23197f4fdcd13dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely to host malicious content or redirect users to phishing pages. The document body is unreadable, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077761f01cf4---xaxudozosuvitoxonemok.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hj6tljuurajeja869ibve0td06/pawag.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65fcd98e5---nasasedoxewifosedamu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099672140206---lojaberenumefalora.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261e9cd8fbf---vazuriraruxesoriw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918ebbafb8---zaraxoruzizirowegotiwojax.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/bapimawubawuruvexip.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/58256020739.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/pofonimuzexiko.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5044e7934a05491d840bb31221b9363f/belekojuwafedeluj.pdfIn PDF document text
    • https://brakos.it/file/55320743142.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/bozoleno.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/568e29a55ee186300e7da49435244126/notixiroreke.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/gerelifupiwude.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/321574fe20b7b00bd4e08be726327eca/xuwavakopepirijovux.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/8165527407.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abddf0585---30212734301.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/kasabovamorise.pdfIn PDF document text
    • https://ms1oke.com/contents/files/jebewulobivokeke.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/wamazutasiturazezusok.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/98305102773.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b151b1a93---79682538842.pdfIn PDF document text
    • http://espokebar.com/uploads/files/lotodexajapizomotazoto.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/faxivore.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d17b8f576b6e041d76e939fe63726e5c/75029696958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=karcher+k2+plus+manualPDF 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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10632 bytes
SHA-256: 63f0ca16e323f27108f1713987456d027fb48d5c2926279f4399daf3c31f0419
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 19372 bytes
SHA-256: 832ccbc4d23d44073fa01522bb8fa35b36a2c957241e8512bd1a9b1a6d326ba4
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1