Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ad7159db0e5b43…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a308a2df5acb1ec7bc3c345696c45477 SHA-1: f7d9fd52a85aab104380458719b87dced5f7f9b0 SHA-256: c4ad7159db0e5b43274310096a5469334af9e11f0e7b0de408f9b30e493300d5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary goal appears to be directing users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5372

Heuristics 5

  • 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
  • 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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5aa543dc---68995998974.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/92569263664.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/70166067976.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/4366578014.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/gerojixes.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/kopetalopilop.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/77227557207.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/vijisedatamakuto.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tazojujamegumofudib.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ade62a98---juvixonatimeza.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/10082037236.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d018cae---bifigigizolegobik.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/pojubefodajame.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/welevelisamo.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/pavaz.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53146438919.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/fabasowuj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429e1ccdea---94416487009.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/15008648471.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/9165520149.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ganev.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/53848822334.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/64535728200.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/2657609070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hack+someones+facetimePDF 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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 17892 bytes
SHA-256: a969fc35bcdee81b923bdc2dc73bfbfa2096c9deeaa977ecba923adbee761f9e
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 10624 bytes
SHA-256: 1aa3487395e9077181fdd7bf8f503af2dcb28f9edc5132b2f80d64738e541ddd