Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95e846de4d738a1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 20:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebc3b99ee2d74b071387572d0eaa84ad SHA-1: 1ae446640058be11fd72974a1cedd3e9140d04db SHA-256: c95e846de4d738a197fe21cb7489e9e393ba0a9727d52c5b1888e216f47f2560
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload directories and other disposable hosting. The document body is unreadable, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://djarkitek.com/temp/vinney/HTML/userfiles/file/43102704810.pdf In PDF document text
    • https://kopari.hu/files/file/dasuripe.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/lufemalogumudalopejapuj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/widawud.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/varovidedevovajutamajet.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/jagosunugexegenalizib.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607000f6c871d---tisesibaxov.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/26286373180.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/riretazigu.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/79411238904.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a40c7be63c0cc622ba6bfa97754d8e02/69818877399.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905a1b5820a---nufezupaxoxepux.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/46785315220.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/bufoselifawili.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/26861812912.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db86471ed---zipogotemuwem.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-23/20210723145718599442.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12334814c---91944746073.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080922fd29e3---43375448727.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/bazizirebesosala.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1ace7327---25863806459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chuy%E1%BB%83n+pdf+th%C3%A0nh+jpgPDF link annotation
    • 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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 10748 bytes
SHA-256: e87d42f703cd95f313c161a5f1320012500d05185aca0c921febc102ff97a0e2
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 18928 bytes
SHA-256: ac0990863e5a18821f5fa49152a827a5cce400b4ae75da805f32ad7fdbb717ac

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