Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2905f793586aec3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 06:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b22d83f0123c20845b58360469e24b87 SHA-1: 26177458de1bd5b58b22a615d76d49b68d02048c SHA-256: c2905f793586aec3d27975266ebf6373baf50353f4277053df45ea2273cd87ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://geasit.it/userfiles/files/34302852948.pdf In PDF document text
    • https://vayamcs.com/content_files/files/suvugapasegelak.pdfIn PDF document text
    • http://1carl.com/userfiles/file/21431850430.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/74749264245.pdfIn PDF document text
    • http://demkapi.com/resimler/files/67634964629.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/vojikesa.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/vudaputupugekil.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/14433132776.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/saxoxogival.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fbd8643a8ae0def1b21ac020dbbb4005/85001175157.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pudomixoxolufo.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/baxifiv.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/pubogafudetubu.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/14284940444.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/44017499314.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/kipusuniwu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff2c29b5e---wuzakoz.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384dab51178---17000484897.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/magomivagotukuvimazede.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6edd7ffdc1bbbc22432b46f97c91821f/duvezivemuropumepifozek.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43514740---42033447896.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wivoxikejufozogowefiw.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/regibukivunurepobomijex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baraka+mortal+kombat+annihilationPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC272 23032 bytes
SHA-256: c5cc1f493ff02dd95426128d5dfc7cb8507645f861d42cc880e557302b7a4706
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10360 bytes
SHA-256: 86073f4e9023784a95ff2831cc349c5981f4e17b88baac389974515fe4b0926b
font_04_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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