Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40101709b7ee7a9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 07:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0e50fa386a3289e0554f2448e92d8dc SHA-1: 933d47f9170e7fd9d5cafe9dd608154a348d3549 SHA-256: f40101709b7ee7a9cbdec51103150d3bda4acab267c47a1b5aeef42bf6605d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=moby+doc+watch+online PDF link annotation
    • http://istihdamhaberleri.com/upload/ckfinder/files/70208285992.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/tatonipumikupegopulad.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/xuvegotogegatakekudib.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/6376048303.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/newiwepebebep.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wesovepoxoneba.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16144baaf9ce09---32577675907.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sekenabimekasakivutidowa.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/icloov2hm0700jppvrd17sa474/94916469289.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9598892802054983dc7a3bab195b8687/fenudadenugijuzeke.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/mujosutapalalasure.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109021806319712.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/feribopubu.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/70131452012.pdfIn PDF document text
    • http://hevolta.com/upload/file/gugafukubuxin.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051012319695.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/18482909341.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/zamuwegakewo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/60e1f1a9dc7ef863eff6a68a2e264ba0/78788124696.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/molemowolu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0b53a02476be535c9e1b06a3b02e4388/fesapakifogodoxufukov.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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 16812 bytes
SHA-256: ab8d886f0691c917b2d87d3a5cb7cbcee7ccc0153213fd047916f0c52059f44c
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10532 bytes
SHA-256: bac97dc5cd425dbac49cbb1b8aa3e6f2482f65cae4c45794431bfddff85babec
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1