Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32726f3729d0bc0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 20:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9336e655d2642bb988fd2fe950b6fa61 SHA-1: 7ec5fe86cbdec2088e3312ad64675ed3dece93f7 SHA-256: b32726f3729d0bc09777017b54ece46f57f2b8600c68e59b56819716712f14ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://namthangbasaltstone.com/uploads/image/files/dusokufudo.pdf In PDF document text
    • http://bagiez.com/userfiles/file/3369609759.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b44819b99896e134225356b864631c84/bevuwozofeberuropuror.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/69255a5d6ead437b3b4931011755a536/6792113487.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913e32e4528---60730195656.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5e7f49b9755a4d2ef0a046d2477646f5/9480884396.pdfIn PDF document text
    • https://unaizahic.com/Files/files/xojesunoseguna.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/edd1a61ddcc859d8f430fd80ebd969e2/mupogowikizajojer.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ebd1db50c2ce8cdb6cc04cd32aa99a60/vawazufizefi.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/wudojuzulek.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210707_4046B530862F71BB.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/69618042994.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a45fde075dfa2adc1c1990c451976d86/17758988587.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9a4d82b850a5736747bd102514f5628c/85513507303.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fa441k4ndtt8151s6mpf87vllo/13271145362.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/85473477515.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108131612011106.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/26512217472.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/18e51e2c05a7e1df8340db19cb31cbcb/sazatedu.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/42033408224.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6f4cd7e4---kojujuzujuduj.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/letapobibepugis.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/jekenemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=black+decker+belt+sander+manualPDF 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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 10704 bytes
SHA-256: 49378089a530f5d758507b4949a72d31304ccec192476dd52866d53af098c71f
font_01_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 17892 bytes
SHA-256: e8c1e913b6edfb9f0fd0030ad47336f6dddefb086e6e0180cc898f6d95858798