Malicious PDF — malware analysis report

Static analysis result for SHA-256 9873c84ce2c4a97c…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 06:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b40b45f0dbe3c3ec5af3f9fc32f61a3 SHA-1: 7a9ade459af1f4894bcc72ea23474c846ecbe109 SHA-256: 9873c84ce2c4a97c56ffb510ccb60954fb34cebcae62478011d14d96603a4c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pistant.ru/uplcv?utm_term=my+hero+academia+two+heroes+full+movie+free+download PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c7ea59c655b8970055580c3a43559508/gapesugowegomazepid.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9534b30f4d69b10c04a6c0220def753a/fanekoremav.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/voxotaxakoxiwiwam.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/92766972929.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/vudowozivabudodowomaxiv.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/3973705441.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e22d4a09e---pinunagekudimif.pdfIn PDF document text
    • http://kasargod.net/uploads/file/66397552665.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/lixupebamologovezago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b84165c8d1---pukexisisimitupe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1b746625---39314987987.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/iongfesbm4jaiviidvv722eveg/nusufiregudadagutolatuxo.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/53703671542.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/fc29558e8f535087c99e3333926eb763/5949584671.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/lorapevodujupokijojepi.pdfIn PDF document text
    • https://computerzone.pk/file/fakajepogasoxogukuletijob.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/sugewubuxugapawop.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/89260924300.pdfIn PDF document text
    • http://coffee33.ru/archive/file/kufetutilatimopibese.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210829091047.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e1df8eb84484b5759aa7166a13ecf208/pifabomelisokubexunumu.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e03be31452fbb65f1c82bb91399dd88f/68723183362.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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 11100 bytes
SHA-256: 6ba4a36fa61fdf80975c9f1c5a9bd38ebd5f3d1f35dcc87255173e0a3bfaf661
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 17580 bytes
SHA-256: 34cb2b2b78baab481cb5c0a0c7f44b77ddac3de9669aa9b756651a5bf353b042

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