Malicious PDF — malware analysis report

Static analysis result for SHA-256 0befb39975b59c85…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 16:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4b6d224447ec7858f7207ada87ba039d SHA-1: 745094595bc913ce7a67a89769c5facddb89164c SHA-256: 0befb39975b59c8592d48df811f2c8a9758d8470f6e3d9138b8e3f9d176c8cd1
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=33000+divided+by+12 PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f27deddc52be7372a9c89b704849b05f/mudidutiripevepemevo.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/zomuzog.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/66906186727.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/18744281578.pdfIn PDF document text
    • http://foodsaver.nl/app/webroot/files/userfiles/files/zavuremapaxoboberorul.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq3fjdi0bs3240gp2o70jva18e/zurezifajavewemupe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122ef9e7c8---bopuwerunobotetusubuxi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/74763168188.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad95a4f13---92480187861.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4npf0uu8hgcp1m9to085v0lmk3/18659449417.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/kakqu8oi2f7dnchhqtelo59963/365272110.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624350158.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079035d4f0e3---nigadotuzo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad927281415---fuxunukodixon.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/udpo5pumk4k3hhbm7s41fnqj0o/xidozavar.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/butugowele.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2e7a5567---nerusirazumufefu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d578ufq8iqt03bm9i22ijunkfu/xabowobipuziwowuwof.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/wanurimajuwumu.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kowemunavu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/80lvaoiuk7o97hc6oh8u8ljgg5/85477454391.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8c4e932b---kurodasanefosebapar.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_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 17124 bytes
SHA-256: 4b426b83b5f73424d787431216db25eddd3adb4eddd9093cdf85ee2c41991027
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 10132 bytes
SHA-256: e3159e49e85cdf23fe77006e5fe8c36495fd5e2436f49c6e4b4e54e98855ea31
font_02_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1