Malicious PDF — malware analysis report

Static analysis result for SHA-256 8433d86699952b85…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 15:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f082e6342c8b6501870926eef055f7c SHA-1: f2fe2923c4789985143a28eadc59849bff90f3dc SHA-256: 8433d86699952b85a363b50bcd74df17496193df1fe6336dee47d49e74e099aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of these URLs and the overall structure align with phishing or malware distribution tactics.

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 https://smidgel.ru/uplcv?utm_term=windows+7+home+prem+oa+sea PDF link annotation
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mukamerit.pdfIn PDF document text
    • https://kuepancong.com/contents/files/75547790966.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/25994197318.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55c362cea---12627290951.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/32913329579.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b64efd6341---46346666592.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/fasexanu.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/20982377492.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/14041346581.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/xafasunologo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/6935813957.pdfIn PDF document text
    • http://vlajamo.cz/images/file/vubugegagavafijotuvo.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/mitasose.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/59895551947.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/filid.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5256888845.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e30150fcd---xefebedumexomuxumugovobit.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061028257055.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16305204179090.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/gafujorafoxexerom.pdfIn PDF document text
    • http://patroha.hu/file/90374598501.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/19108175401.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/1678003570.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/pefajexapatusesiwepozi.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10644 bytes
SHA-256: 908c1caba5f7433b0c9a39b0b658ae6a73e252daba670d524bcf354ac4b2849c
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 17400 bytes
SHA-256: aa20189dc7185e21a1bdf9b2bba64407a70decddadda0379f1bc1879c94307d2
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1