Malicious PDF — malware analysis report

Static analysis result for SHA-256 4321a92d11c04cf9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 05:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c74d4a50422c4853fd22f325edba6d67 SHA-1: e2f42951f4c94463398d33015f4e8107c1f84a9b SHA-256: 4321a92d11c04cf989890188fd371032d1c6c8e734517047942ab47d38f43011
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 upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0918342da---maderixadetotut.pdf In PDF document text
    • http://atrsara.ir/resource/files/jizutorepenib.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xofetavexogasaj.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/87215238763.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/liwudatabiwuz.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/434b7350aa6a3ba14ddcc3e1332acb54/42408868670.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/67383891581.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/72080812747.pdfIn PDF document text
    • http://askaudit.ru/price/foralotivesune.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/78565164881.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/jofibobulawisevin.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/nufolesakoketosususu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9319aa8b3---21483879536.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/bumodaxugoxozebi.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zedatikufuvajewurereboned.pdfIn PDF document text
    • https://atavio.ru/files/file/sinasutelulikorolizozino.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615046d096a67---46407891899.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zotire.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/vamowexajatexite.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d923869092---xejubitu.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///nawurepekifijux.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/xobobimepoz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8e9431e3---48987228763.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/nupilamatavugijesegoga.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/dobuwasusenanelunaganolu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/zexaxabulodin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=angry+birds+go+mod+moneyPDF 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_off0000b5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DD 10520 bytes
SHA-256: e213207b8ac4bf5015392b5b62a9070570d075502aea8ee07826026e25e5fbbe
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 15676 bytes
SHA-256: f23371901ed4679b2431ae476dc44e1e8b7a1eba3b6de15a5b08f9da07385e26
font_02_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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