Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b825156cdaa3ced…

MALICIOUS

PDF

87.4 KB Created: 2021-08-06 03:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e692ba9df9ab5fdc00e9142e524518e0 SHA-1: e15cc3a32e2c85791e4b0967e19aca9b4660d464 SHA-256: 6b825156cdaa3ced19bcaf2079d95157a314c98b76c662e85ca722fe7e2efd64
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable due to encoding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0c93f28fa2c79ac33225f31b448cc050/40657143447.pdf In PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/mivodogegetadovefatizon.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/51320550429.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3comd58kilhshscmh9eigp1hu6/44282524086.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t9om45ikra35sodtcni2add3na/76391024869.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097776ceb6bc---84414765977.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/61247899462.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfefb5e3f---55346890977.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/86114223ba5de78285c2bf3c344a44e2/31549183546.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/29503556905.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775c0f9dda1---27706408368.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/mazibonamer.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e357acc010e---8429976822.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/demedabobexigujogadirili.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea410b44c---60261113102.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a087446eff4---42713862250.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • https://kuepancong.com/contents//files/zerixer.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68eba4b73c---17991863580.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/56fe185076f5197c8d157ea2415c3bad/33272919171.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/691afcdd082d95382f0047c5dd47b7c5/mipusenokojezu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/vuzirubemaxuraxufimuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+karate+kid+2+film+release+date+jaden+smithPDF 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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 10804 bytes
SHA-256: 41bbba68152f25177dbcc3a94aa3d5533edc822bb0088d07dd9318b83903f661
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 17100 bytes
SHA-256: c837f89cf3d23c0d2f8c37e4f93d5b9c0ed5465801942d5cb461868b492a7924
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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