Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c158cde47d0a2f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37e0edee456e538adfec8d7fcbf1a86a SHA-1: 92a2b1b0ad88268ac774aafad997ad882ba81834 SHA-256: 56c158cde47d0a2f41ed1470a5ca55812d229d63d942445985bd416ab5beee43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the heuristic findings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://wastran.ru/uplcv?utm_term=mon+cahier+d%27%C3%A9criture+cursive+pdf
    • http://interiorconsignments.com/media/file/gibuvozatigimatuboze.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3edb1vlffldt1hjos9gmvjr08p/silafutefeludologa.pdf
    • http://kunjipsc.com/uploads/files/74288497443.pdf
    • http://detikakdeti.ru/img/file/raxunimanojepifutagavu.pdf
    • http://srilakshmienterprises.net/uploads/romaw.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/fe799bed31880d62e4e6a3420a920723/lopamibetekijemegazik.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608723b89936d---lorokixoxejeramijifulu.pdf
    • http://lubrifianti-auto.ro/files/file/letara.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f12771694bb4a6f2c99559002b881b6a/95567188153.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/83mjeqpsffhf0t6d69fuod0s9n/niwetezi.pdf
    • https://jewfri.kr/files/image/files/83234559174.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c67a87e58517ceadc5287a3a2824df8f/49028572662.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/ruridu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/60154039167.pdf
    • http://machinesupplier.cn/data/product/file/2021826_13390_886.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c76274a3f---42737246652.pdf
    • http://membranekeyboard.pl/_data/file/kufejoreloxonoximul.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/xuxekawopitafuba.pdf
    • http://nitexprofi.cz/userfiles/file/86257783575.pdf
    • https://condominiovillage.com/userfiles/file/66832668295.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b28477f---11132970737.pdf
    • http://xn--aknmedical-yub.com/uploads/file/85736658265.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f9a4b96e---suzuzo.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_off0000c14f.bin
bb5a1b60aca21dc2d8c644bb3620647fd995a538e8d95925f41c59148581c88d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 18236 bytes
font_01_sfnt_off0000ef41.bin
1275098674a14eb850a414be2be898b10111e1f18644e2fc83e61bb1c66acfe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11020 bytes
font_02_sfnt_off0001089d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 16792 bytes