Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6a0ce4c29c4377…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 13:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5eb9e2a28cd74888a9370a8f95c47650 SHA-1: e05477799b4b4568188a3a1cf26ba991e25f0253 SHA-256: 3f6a0ce4c29c43777ba69457a4e522d8924fd3438db24b4e2f97af71b00cdf1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa362f87ee2---topuzefomoripo.pdf In PDF document text
    • http://trekkingsapatours.com/upload/files/regiwawenubumumus.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bopigetipujixesedodub.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1e9e67ef---11355034311.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b8440ff90---jugeluxatuso.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c888aea0---kuzobedipanelivajo.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/mabixupevawatusid.pdfIn PDF document text
    • https://ocw.tw/uploads/files/kifexorugupud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9722b84db---vikado.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/gobakikimive.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/joxesapob.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/51elm8j0p9ju3cg2k1ugfb8v54/13891064276.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/fuxovirigikek.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53069723618.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/derani.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/77825819927.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16117927e60690---vuwudogajot.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/75429507848.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/10d66f0dee57007ee9e8e4912572969e/jefoniguferedevusogo.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/57324869306.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f67a4ecf---bivapuv.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/lojijenijugiz.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/1762423131.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8ed32jhge3nucr2cvjs7ri1881/62844334115.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/56710351014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lazy+spa+maldives+user+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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10632 bytes
SHA-256: 6f8028202942ae985195c0ca4fc47948baa22e6f0b584a3687c3d3f471c7db78
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 18508 bytes
SHA-256: c1b6c56e73af6ba6635c16f80dd1c3666ae99d130382255ad15f92bf2a83ca52
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1