Malicious PDF — malware analysis report

Static analysis result for SHA-256 168b6ce24e3a8e38…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 13:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8dbb2ed420d857205e96ec5e8260d759 SHA-1: 98fe1af8fa1e4c519fd382fea3aafa45f800e11e SHA-256: 168b6ce24e3a8e389d70602b1899dd44426904e3083b7031be9b37cceeec7437
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161506077c07f0---68551050094.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0a869f5d4fcab39429653056d19e53a6/xavopi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e447bb86e---89085643373.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/nodadabopano.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/41772363602.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/28885797898.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/43499635334.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/17325489043.pdfIn PDF document text
    • https://robodom.si/files_vsebine/tupisivifakirikutuwaro.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/35659748537.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/74009268867.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/buguxozanifodukiki.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/xikozibo.pdfIn PDF document text
    • http://seamacros.com/upload/file/vebibujenazafumonaduradu.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zazuxeb.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/14874834015.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/dozunisewe.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zazipizorufigutopika.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/getitobesolosefanubofa.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/wavakadifovowigopekoz.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/94389395963.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/gason.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/37664674280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=frozen+movie+online+freePDF 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_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 10048 bytes
SHA-256: 6a3f236ea414755cf150748010d08474c83a050c6fbce33546aae0f2afc7d658
font_02_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 17152 bytes
SHA-256: a1832c1471fafa681a08086b58108979ef58eaf1c061e8959bba440211120e20

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