Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cab759ed98aa95…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 14:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c424aea4cb5145814b87afa819190b78 SHA-1: 18f01f5af1c1959b40bcd5fbbd5e0ff807cafaae SHA-256: 80cab759ed98aa95a9dd4f068d97b9e4fb3cb368327c4de6c88397451950013c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are part of link farms hosted on potentially disposable domains, suggesting an attempt to obscure the true destination. The presence of a 'kings+rising+pdf+download' UTM term in one URL indicates a lure for a specific download, likely to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=kings+rising+pdf+download PDF link annotation
    • http://makassitools.com/userfiles/file///xelig.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/15611821675.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/55254214661.pdfIn PDF document text
    • http://iscelenie.info/files/file/50907532009.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/98391045392.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137482a35bde---nusupukubapa.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/22253506275.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/rubejidekogavep.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lisejozogegobelo.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/mopom.pdfIn PDF document text
    • http://soles2walk.com/data/file/40436168565.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8cd73c77f---kejedikepe.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/65524377961.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161374de4b1477---fonokujovivexador.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/56401076217.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/vodumam.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadc8608fa---lobugiwav.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/uqovfqdmsg2ejvu3jh3cco8a49/lasikemavexodiko.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/bizepovarafadirezuza.pdfIn PDF document text
    • https://theipbuzz.com/images/file/ruzajibijawipesevo.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/fununulikatufigedifaweta.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/22345798977.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad7279e1d---57785699335.pdfIn PDF document text
    • 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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 10520 bytes
SHA-256: ee31737a51a5009ee55b1aa923c9d2c88a722baf2df6b4e1ffa20b94d5047fff
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 17928 bytes
SHA-256: f505a9a1d4783f8a4bdc4347ea575dbce64d55f3461df4c9732ff917be1df140
font_02_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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