Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d957cf0cb85664…

MALICIOUS

PDF

97.3 KB Created: 2021-07-25 21:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45e2fe5984cdc203c4a81d45df7c0f89 SHA-1: 4e8766e84513cdd1e9cae770abeb6feb678caa23 SHA-256: 97d957cf0cb85664a28140423b664c0a84321f361d25eaf67961f30e515238af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://majorsagilekvaros.hu/uploads/file/13819195898.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bb92e71013b---13252231494.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/r1plofgodheicgpr58pnunrio7/temivi.pdf
    • http://htwy.com/upload/file/93510849223.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916766fd62---36588539908.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/95677218789.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/g10q0bpsgckrjgdqh0squ8j9re/zezoxuxopobofotilekiw.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/88433356904.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/72c8065a232b53b26a2761981ce59da4/57454029725.pdf
    • https://echipamente-scule.ro/userfiles/file/55991637281.pdf
    • https://bravo-hk.com/userfiles/file/tofesesugofazafaw.pdf
    • http://hanleyresources.com/images/xawepuropa.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e26a12a1f8c---nopobosuviduwa.pdf
    • http://vantaidongsaigon.com/uploads/files/91348476617.pdf
    • http://onlineexpert.in/userfiles/file/63623045375.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f68e2d0ab410217af0a718d2b3e69833/xusofugut.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/gitezuzufabekigekine.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gddtq684u7bhr33nr7sdc3tku0/zijopakajijorujafevetiv.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/95p3nrlm4hp6rutu7e1dtjetpp/15502436229.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8c4e2f85---mefino.pdf
    • https://anandamsanyal.com/userfiles/file/44731151799.pdf
    • http://banhangcongnghe.com/upload/FCK/file/69935292036.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kahoot+answer+hack+tiktok
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010053.bin
ed093e7c1e40fc64e328590b66d103b7e31d40b0639e19e43c50cc7270a6f700
pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 18132 bytes
font_01_sfnt_off0001301c.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 16344 bytes
font_02_sfnt_off00014615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 16792 bytes
font_03_sfnt_off00015e2c.bin
4b4e33807fdf1423309dede9d3b2e46a311edcbf9a64e7d29526630087ed0cbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2C 10448 bytes