Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdcf88163f86458…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 640d0a6007e5592d993f92db0a72e319 SHA-1: 42a749464da9aa556717ea812e54ff1fbc67c792 SHA-256: fcdcf88163f86458d5712220da420f7466d727d235a1fba3458a91db41fa2373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted for having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://unityproductions.com/upload/files/88941045453.pdf In PDF document text
    • https://rotterdampools.com/contents/files/kanusilij.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/misej.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/levozilujipadezorisej.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/vifegurevumim.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/favemelitipijajoxusil.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/juxigifajevuxapenagebum.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef1f3bbd4b---31521874579.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/97727219014.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/55363579507.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3a0bab0d3075aa3756e5a292e5ea5e3/54826420384.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/053efcc25c82c5116786769bb8a8a55b/97298656976.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/pujofudepibulixi.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/lobodinuwid.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/sufabipoj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f88c8db37---85451345050.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/58868002568.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/52798435750.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/42347125757.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kekowoz.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210909_FC2B2831A8CE8A44.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/lesezipuvakekadobisikat.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/wetelibowatera.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/linorubejisugozidowitofa.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/wujanomemenoruw.pdfIn PDF document text
    • http://redactron.com/userfiles/file/74950157899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bottom+navigation+bar+with+fab+androidPDF 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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 16112 bytes
SHA-256: 5be33de307797e82d8e18ff40be84b247a45714f30ce0292b9b53c1ec960f9af
font_02_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10800 bytes
SHA-256: b8b06c913d77f96114e1ababbb2dc882510c9ad906fe68e16d4d943a6d63b972

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