Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e00b108af3a287…

MALICIOUS

PDF

79.6 KB Created: 2021-07-09 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44be70b772a06035af7d5bc19d24b77f SHA-1: 12da41901c48c82a20999125ca48f73370f6dc0d SHA-256: 26e00b108af3a287a91720ee84a1e76e1ba703a66614353482a991efaabc5d96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, specifically within plugin upload directories, which host other PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7a9a3086---35619630678.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/s17rmalijnogp82ia3h50ns4uo/59777492305.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160854e9422d8e---benuvelatikuwopepulevakun.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vdusvd65bpjvqrb3ktkg6qd251/59780818100.pdf
    • https://easybuildapp.com/files/uploaded/files/memepalobuwe.pdf
    • https://itchanoi.vn/uploads/news_file/katakutep.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/750fem85hqqnpm6vqscds6hs77/7590323413.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jtknscjabhb707ou2bhhuss2mk/pudimesaferegumakevos.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d90dc060cd1ccf722470808baedbf8f5/bozazigovuzizukuke.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/30c979a5af8e996abef311438031f17e/tatolabelulawafeguseg.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/18752424883.pdf
    • https://mabuksusu.com/contents//files/tokasomejogap.pdf
    • http://legalinet.eu/userfiles/files/nokake.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6c59249906eedb4c1d1443a1e8ebb9e5/lefiferekojepikugeju.pdf
    • http://altiro.nl/home/tjerk/file/binijefe.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/mrgdik9lal00avjfq198sjclg7/kakusepotesixanelusej.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d66693fe1004be67f8f6c5da4e72aa58/vufinovejedunige.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uuog1qho68u4knt0p4o8s7c4l4/95274824290.pdf
    • http://bluenanum.com/ckupload/files/34800475684.pdf
    • http://schokoladenfontaene.de/idata/93178148753.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971a9d5444---jelanu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+oblique+asymptotes+on+a+graph
    • 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_off0000d11b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 16792 bytes
font_01_sfnt_off0000e932.bin
e4f5d56c6e7ad5b01d7ea71a871952d37d26130c76d9cb93541c61bd82a80caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 11520 bytes
font_02_sfnt_off00010391.bin
ed2857cac8288f595728570ba4fa7e6afb8a567ce6434dd993a2024cfe6f023e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 17196 bytes