Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b54d372922f365b…

MALICIOUS

PDF

87.1 KB Created: 2021-07-23 11:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29694a7028853837bc10ec3721e818f5 SHA-1: 7c490fc94e9ffdac07463e971dde9bc9de22a280 SHA-256: 8b54d372922f365b88b28d7415b056e97f57d70391f1b23cf975ee95a9d6e542
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and embedded links align with techniques used to lure users into clicking on malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ba8e3s5js4ljqaooh5qe9adb04/8807193283.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6qs8ufdfl1n9fadhcuhgplm0j3/zozurenukovuri.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ggujdi8fjddrsaiu9at784b19h/2750608695.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7ac085d9---99351267365.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7c1583a6---59526136523.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/86854313955.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/nasejupi.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/sebotevesamevuxus.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/wekijanetadudapaze.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51678088b---74428781456.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8e5564ea---malumukibufu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/22680606309.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/83270948112.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210702181457_888551252.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/356e815e58373f06b5c0ea73fc86725c/xaxalupakemiv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c96ee76d---repiloxojez.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a52164162e0---13042245138.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/kufazisajozifuwotamol.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c48593b9ab6---tivujoleva.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/zepuxupitubumigexodizi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078583ff14f7---nolibatubisuxog.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e786da8cb2---zuvavumikakoregifiko.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/lapuzeraboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=compare+and+contrast+jamestown+and+plymouth+coloniesPDF 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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 11240 bytes
SHA-256: 740781890414bedb186bafb268f000d4c9a45adb53407ea17a7c97d0c9a0ca8f
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16988 bytes
SHA-256: 024d1024fc5a4c66198eb4bd2d10bcd658f80fd7b35a3decd29ed4304cdc23b1

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