Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c812f0b4250c136…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 08:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1162f3209f7ade612bc8f6be4f055d95 SHA-1: 439e14a4ef26c880de650eeed015e2f2b564e9f7 SHA-256: 8c812f0b4250c1365d2f914638e8f149623aeac1042c531cdf4688e890dc49b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers identified it as malicious, specifically a phishing trojan. The presence of multiple external URIs and link farm heuristics indicates a deliberate attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://connectcontrol.net/files/userfiles/files/lapuzupunir.pdf In PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/94884997225.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab00cb7ec---xaxosowatojitajalu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/69392508351.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/lulazonixuji.pdfIn PDF document text
    • https://x-software.cz/data/file/gofawadu.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/87265695684.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/demas.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d86e4e085---65261149467.pdfIn PDF document text
    • https://umartravel.com/files/mewoxonaxemeropizim.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/tadajefuzawajomujanuwego.pdfIn PDF document text
    • http://linker-apps.com/files/90739884673.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tigase74pchreidealbjq0kv4e/roxaf.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/98408072429.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131469a19e4a---89193579913.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/ronorisigo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/69398eebb21a0439bc84d3c7fc76affd/58413948078.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/93354094346.pdfIn PDF document text
    • http://cold.lt/userfiles/file/zutegurefopag.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/38749173834.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/1692386184.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/58372696048.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/59845027053.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/xulebapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=another+woman%27s+life+watch+online+freePDF 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 17652 bytes
SHA-256: 1432bd3ddc6f54bca478286c2628dc61582567fb2009869e9a34db0152ef01eb
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 10704 bytes
SHA-256: fbbaf6d1b2782b23b37023d536ed14691494c39572d7b6a1f7b43fd12a814799