Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6ef77661432ea5…

MALICIOUS

PDF

80.7 KB Created: 2021-08-06 22:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0b73fc3e9eb7b237c7c6feb37ffbf4f8 SHA-1: 8779c99528ade324afa0d9f12d3f538e12c3ca48 SHA-256: dd6ef77661432ea51b2abf230b52442c31300c1d9c1bd737fb6e145d3a256999
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. This suggests a multi-stage attack, likely involving phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f6c91debaa66bcab6dc4524a6d896cdc/xasugetifedinaz.pdf In PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/50413164877.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160781d136b487---22435236567.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d008abb989724407b710a4b085d8c1af/57197690054.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d091e3d7bdb3f88245c5b792fbee80a6/sutedize.pdfIn PDF document text
    • http://tele-video.ru/upload/files/senegulevekudodikenukapab.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d9efb73---xudibotutiritojujizim.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/43790938440.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c1bd906a6---rukilixiwevol.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfc054dd4---moxotunogezulome.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/37910404919.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/93435339442.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba380b86424---rekolonine.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/lezuzuk.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021060516228673987.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/bulufoxeta.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608363c9252af---15704559992.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d95c1774c05951399c19d3f3fb892317/duxalozifupajaleguboti.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a81609118---mekafad.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/nelaruki.pdfIn PDF document text
    • http://bronia.org/userfiles/file/77054719800.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8c2f415a---japikagegodezumawajoxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=planeacion+de+instalaciones+tompkins+4ta+edicion+descargar+pdf+gratisPDF link annotation
    • 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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 11136 bytes
SHA-256: dae53720ff8c1f010be2f32343e78caeb2bde8a6463b6747c9e40c573506e629
font_02_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 18416 bytes
SHA-256: b25f688a847149a8617707b60b52ad2c74bbc8055e22742eccaab94270d2eaef

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