Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d79ee0abc8fcce5…

MALICIOUS

PDF

88.1 KB Created: 2021-08-14 16:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccc163d1b72e3b371ffe8c5fee5faab6 SHA-1: 842fd1a946c025a19e22ceefc5a2065d607890bc SHA-256: 9d79ee0abc8fcce5332f38f927e3d904a30f47652c336c664b69416b591afd68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm hosted on compromised WordPress sites, directing users to download an APK file. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading malware, likely disguised as a game. No scripts were extracted from this sample, but the overall structure and URL targets indicate a phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=download+file+grand+theft+auto+v+%28test+0.2%29.apk PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a8fa1c0a---67700542713.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc3247d3f2---fuzekofinowilu.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/sorirokib.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gumibotoridafatesukibu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/76787170946.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c1d2d52814f1e09bf1cad912ced3c0f3/kirud.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098b00a86b0a---61369442837.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/31671511937.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fde1dcaa14a---wanejefowefemulix.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/82642740510.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/fisapenilim.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/wevazosaza.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/53910894639.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6a0rh5q9v171hnhbpscruaicgr/debijug.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b45164626bdfff6e870298f39352797d/44967299747.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/noborijamuzedoda.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4e2c371b---5840939734.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/98089705659.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078e083b96be---fojulasotuzukododosuzozud.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/57296404540.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c934c1a858---papefogagilaripagajikox.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609076a180af5---vekuferovil.pdfIn PDF document text
    • https://samowar.ch/upload/file/natusi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089422a35670---fekebanefibu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2d6d7f13a29fe985c8db0d456003587a/31128628748.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e3ae974f0beb28be26df1c2a2999b051/padovegovenuzokari.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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17248 bytes
SHA-256: bf2edee121cfe446c95f0fa0f5e5ab0100b897cf8df0cb838616580c38361e24
font_02_sfnt_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 11588 bytes
SHA-256: d758998663f67a551ec64f3735ba102bb9b6dbf8eb25155ce483ca24ddcffcb5

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