Malicious PDF — malware analysis report

Static analysis result for SHA-256 99430de1715e3e5e…

MALICIOUS

PDF

99.1 KB Created: 2021-09-11 16:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 588492ca7467c0b8dcc1f891812daec0 SHA-1: d6d5581cfe494384dd63fe308f1e9aee68c8422b SHA-256: 99430de1715e3e5e23854fac2ef3d1ebf268db803493d6bde844d6e8e5a5c7f9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS platforms. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://xn--80ab1a9a.xn--p1ai/sadm_files/3139496187.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7d4b22f2---33897194517.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lutirasimupuweviri.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/23528687271.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-01-57-23-87.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/21076778565.pdfIn PDF document text
    • http://nemochem.cn/upload/files/kivabubimigajiditi.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///jezutisu.pdfIn PDF document text
    • http://epmachine.ru/d/files/50300108398.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/rerejezemajofipero.pdfIn PDF document text
    • http://xsteelstock.com/d/files/fezugi.pdfIn PDF document text
    • https://gilbertems.com/videos/file/rolutedeletuzagut.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///96492194497.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16141591617.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8fbc3903---82196921893.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/8344234757.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/99316213919.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/070450116334.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/bomonajupo.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/feririkiv.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/63108095189.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/kenaxurop.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbad8ee4e---76093518685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=little+singham+future+mein+satakli+full+moviePDF 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_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 19340 bytes
SHA-256: ebec84df52c1fbf8ab47a565b8a6c55d72046f2691e39525435aebdb83b106e3
font_02_sfnt_off000165aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AA 10876 bytes
SHA-256: 26179a5f6f64e313a51f4962664f9e1e03f86fd7d54a9d0a85638bb163ef2e2c

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