Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2958b1617c23ef2…

MALICIOUS

PDF

100.6 KB Created: 2021-07-17 13:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 15ca0e5ccf88ae5e1447d50277ff5531 SHA-1: 62e952e72c7a2cfc1a65653684c8522618f3a496 SHA-256: b2958b1617c23ef29644da5865b7f2b2f5be7a282972ef07c5c9541b8f39e297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicative of a link farm for SEO manipulation or hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and heuristic firings point towards a phishing or redirection attack. The file's creation by wkhtmltopdf suggests it may have been generated from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://diedacorporation.net/freesiafiles/file/61329671748.pdf In PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5cff024fd18588f78900cfa3170f0610/78772383158.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/19455066298.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73a3e07a8---92780918953.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/jaxifugemegano.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe76c7970---41569833390.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/norujofarazu.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/76789392952.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2774f03086---80566216197.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/090095ac26737c06ff334f22a27f203b/15900510316.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/zakobigelok.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c279d39d002---kuzoxifu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da23224e5d---bufarum.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/34384558249.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b611ab8600e---66584369766.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/xiveredotewurubezusolaz.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943d33c6fbd---62896103829.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6adb236572775b22f9677d2cba00a857/nimuvamow.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/powir.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c92e82008---zupuj.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/fibafena.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc109ccb9---60087926228.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4kus0hc31chfo47da8t1gkv224/99837246713.pdfIn PDF document text
    • http://naoshima-habitant.com/19475077018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=screwed+up+in+tagalogPDF 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_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 10780 bytes
SHA-256: 91aa71598ec38dd5e2bdcfc65e89252e7c22268cf0415188742363b93832b33b
font_01_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 17632 bytes
SHA-256: c863e748756141cea51f85c07b600dfa610197c103d7abe95565a07f09b1c9fd
font_02_sfnt_off00016d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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