Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0681556bc6939e…

MALICIOUS

PDF

94.9 KB Created: 2021-07-30 01:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e49c0c23d870df64b5716ed6df8c36a4 SHA-1: d7d41c8cf22e9f2d56516683daeeca3491e8f56f SHA-256: cb0681556bc6939e56761f0d4bba58cdbf20df600ae9d961d035fb1fc62465b6
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4e0cc25951403e5b7e123b054783f7b1/vikifizibotufuxegep.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/pijitelagizegilexexafav.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/rebuzirewakuge.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/degekafabeburetax.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/49313757170.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/457fl6ul5p5nkn8p19o4jr0gj4/jilirozodemujegigoragop.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/73689410767.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/r156iusr9ibt5mir2tmaokm803/volele.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce4c35f5e---jopiwepafijororojewover.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924eba1165---10777011553.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/57834802989.pdfIn PDF document text
    • https://best-label.com/upload/files/doranefuxanis.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/gudujiwi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/83911627444.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6858d3474f6abb8eb32c04a6b6ee830a/65858692497.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lj4p39volprubl7l0k6195d284/35461151123.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/39057928408.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bad796ea4fd---31316217220.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/h7jidnpm4hqipcaieca89vtq7r/78908334598.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/97520053196.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fed3ebf9a---xiwotexenuwanalifex.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n1kj02kp1g1dooug1lhvrpcp3n/davumisuteverivomof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+magicians+todd+imdbPDF 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_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 17924 bytes
SHA-256: 7ee4e321633e248b461ee51ac8ab968f9024ab4bfedc5a29ad3d8c8fbb029178
font_01_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 10776 bytes
SHA-256: efba229c6dc4027c549c9b6107bf2d9980eda1f74bac30b4a1647d4b166edd56
font_02_sfnt_off0001563e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1