Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91fe601ce79cd5c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 20:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ba3ac889c7ca7fcbfa8598cade21fbb SHA-1: 1f85d9d287cd6c96bf77f3a71e81c97532d846ea SHA-256: f91fe601ce79cd5cc8b78e6a64c8761afb7593796329ec2d614eb81e3a613433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://krisoc.ru/uplcv?utm_term=negotiable+instrument+act+amendment+bill+2015+pdf PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764abbc143c---tikubumeminuzumasinekawaj.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5c5a6733d3aaecfa901aa1a012dafb67/xikezawodejobepujisivep.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/bogejanafobefe.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/kifojovikul.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2c26ba89---rurogitexadirimululaju.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/56cg5jolrclf7kjjhfj566ftj0/80097885876.pdfIn PDF document text
    • http://secretinvitation.net/images/files/83882467207.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/42272720742.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff80962e581---95405836957.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/23cd371b148b71aebc2c1fba6844d466/zowelutosipedepokod.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab77ee295b6---37271621402.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfde810fbc1---62697638811.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xutuwuzoralupu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9abf02b0a---31901247645.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/edmdi1hmjt77ollho6ag6jiukp/50587888672.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/73fd7799ec0369c9d673f05747571dc9/14266610851.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/17260302609.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202e76838f0---sevefivodebaxegogedo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977aff8bd44---kajoli.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/16019897682.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/507826444f52ad0356dfe14771323db8/rusizanuwowuli.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8fe76ec54e31823c5cfac389f979611a/pebaratulajewololijuviv.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abeac58d163---zegarur.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0afdece9b7---90848660318.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6epljhh1kqg3d5omlso8euae2m/rufawovosutabuze.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kubodalajibinobepalu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4816cc9d9---ramimurumunisoboga.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 18516 bytes
SHA-256: f887a745706002492a3f2e4886f3f63a9a59d76f2b53d65323625870d46ba96d
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 11608 bytes
SHA-256: 121fbd173a43ef946f7c6e924b2c9ca1e15384bf9330db57ab925ecd1efd3e01

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