Malicious PDF — malware analysis report

Static analysis result for SHA-256 c960c87c15c32cb5…

MALICIOUS

PDF

112.9 KB Created: 2021-10-20 10:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 19ea76e340830a36058343294dd3682e SHA-1: 66f0e3b2b77bfd4d48a420b0d92a322dedb290e9 SHA-256: c960c87c15c32cb56047aa64bfbe2e73243ee5e3c189436dfa6cf0c4ced3a3b0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://naasschoolofmotoring.ie/fckeditor/userfiles/file/mefipilivakajeki.pdf In PDF document text
    • http://swiss-ex.com/images/blog/file/41611070554.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdecc95cdb---51211666912.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/26990038797.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/45140697410.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/29005482323.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/pilumalopemar.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/kirafoworapejepozaro.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/26055518483.pdfIn PDF document text
    • http://amdind.com/userfiles/file/75774835477.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d067205ceb---12021763817.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c631c1887db4d094026dd7b1fa80b679/53502722070.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/pizimufefawarunoboji.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1616a9f4c15b0b---36900550775.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/16187918628.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/75e873d82d7dc29fdc45cdecc59bca9a/36014458880.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/rebuxedigi.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tunapi.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/vajakanodojoza.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/wuxubupiwiviwabuvor.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/lukavegubizizopozaror.pdfIn PDF document text
    • http://konberdbio.com/upload/files/18998417886.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/fapufobolere.pdfIn PDF document text
    • http://badgerhillfarm.uk/93571294513.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/pefitibekuvojuz.pdfIn PDF document text
    • http://guitarenko.fr/img/files/vutagepafifiza.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=engineering+and+chemical+thermodynamics+2nd+editionPDF 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_off00015286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15286 18828 bytes
SHA-256: 63cdab936d6e0d5c0b9ec4e53cb9f8048279169054c18b03235f327b79ecc8cf
font_01_sfnt_off0001844a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1844A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C61 11032 bytes
SHA-256: 3d7187a0db80a659f336feb08ec3c44cb37841d0d31d4d005377508f6e62df54

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