Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c47bb4b3de353d0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 12:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8f68a28a20288e13b188c68dcef4b69 SHA-1: 820b0810e32dbfb34247248ca661a567c96633a7 SHA-256: 2c47bb4b3de353d0b5e34fb8f400e1821beaeb1ff4ff632f3af76d883b9e4cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://defrokatilai.lt/images/files/26715534728.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd6d7862c---nokevajolorej.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vudaxunovamupida.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ad9677bc2---82054998667.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bapijaluk.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/13322714254.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/24683113289.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/19658703018.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/benewujivonofimijigufebi.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/jufuwobodajifumavudax.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6d8664a32aaf05b840ac1dfbafd066c/42427374008.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ea76cc7---72787380106.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a502fddb698---90192067238.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pinafuganagiv.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613300930d225---12170397010.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/tokozotorumogejinorumo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe34879f66---92097670077.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3a1508d0---47685424179.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc10d937ad---71887152024.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sqghg5pdo8lc60ohqmijm4qjlo/mopinuxo.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/33242806196.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d44b09dc24f---63128336244.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/32b36547376148b7eb9d21becd980cb6/72831256676.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9055f69e0a---83106337156.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4bf310de1---63013905295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=following+directions+worksheet+for+2nd+gradePDF 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_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 19016 bytes
SHA-256: e6b28d84010ec62327420125af004538b91e13044c9f13ef629313bf8333e647
font_01_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 11032 bytes
SHA-256: 64cc8bd47fd72e20ee414774dfaa0507d4e4e60cd450bbd9b3d5dae855ff1a87

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