Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75199563a3d9638…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 07:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a89f76dda2b08c082f14a4c841d483 SHA-1: 38db7ce90885c9bf20b59390318362c52fce2526 SHA-256: f75199563a3d96384b772337254b6e91f7924ebec799360177947bec3a61aec2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=miles+to+km+conversion+rate
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/56b8b6e533d966193318c77f1b68789a/rajitimelajeneseku.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/843c96e76daade7a6d0f4adc861b57e5/16079461535.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/06e7068c5c7b0cd2d277694cafdcac30/5251281650.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d05d52fe64346bf36875a6114aafb82f/vafipit.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/64411982200.pdf
    • https://suprizpin.com/calisma2/files/uploads/96509520637.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1bu35sdmfllgom94aff3qj01pm/jetoturopikun.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d1f14eba256f6bd3e7d05102adf3463/vekulamifuwadeg.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b312e65e---molenilodovetubi.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1b55ec98---faligasetafedupidojetu.pdf
    • https://alihuata.com/userfiles/file/juzumanumosugasikap.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/39vcbtlp9tgrn94ir67lfsbqo2/dujumewukamologenolapov.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0dm95uej00heufi6bappjjlvum/6996993037.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff08a02998---vorubagojidizenejub.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4aaaeb51---84310638333.pdf
    • http://beerskiboot.de/img/upload/file/67156679492.pdf
    • https://cmoretv.com/userfiles/tamepanopapajoj.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d12bae8ada---godivoboxefa.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f66d594d4d84bd9ecf148db74d3acaec/mubakegeferozidedopuwom.pdf
    • https://alianzatours.com/imagenes/file/nejeporujudu.pdf
    • https://betenenergy.com/sites/default/files/file/5839679974.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/bilikovusobolofuzofaxevu.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d983e070c4---mavuradidasidusurigitijut.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5136459852159dc72e9accff4511f832/70787966126.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a688f68612540531b5c5063444ea8d04/rebanukevixuruxukabowu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 16792 bytes
font_01_sfnt_off00010cc6.bin
d85c252624bbbf42bc0d6b96c7a8fea24d51c547ed99377d188351c9b6b4c120
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 17780 bytes
font_02_sfnt_off00013b52.bin
9ebb157196a4196b4315a60cf347985ef89cf58db4a53405dfef39ed8b6e5ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 10544 bytes