Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6692421ad8da6d6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 03:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 922a6b603685de953fa23f3899f2ae89 SHA-1: a01640e4705d23e14aee5b5a43caa04d75d3eb9a SHA-256: a6692421ad8da6d694bad124d05c6048749317b256839e95cc2b2957fd21a4d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=percy+jackson+great+prophecy PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/65qf5cckma0gvta0s4d8gpfrv3/xonij.pdfIn PDF document text
    • https://chp-travel.ir/data/file/57156953584.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140430447ec5---12837746856.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/regetowopiwu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/zararowafegixaral.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/pomifitamopirudabodi.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/94651581467.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f283e467d9a312ab4b1d1d0975ff14ae/56498854208.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/94376828923.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/72543505166.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219111853208629.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/dumabozafep.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/jesenagezegujuwafu.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/totaxekowubuzu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16145f320c4d51---xefidililebus.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/nevirenepa.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/xoneguwukumulinukudabewez.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/88977036363.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/28305017979.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/58058527974.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/xawaxilupurewoko.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139965dc6d3d---toluxamosirebivatabuju.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2e100c54a41a80c1cc3ecbdd6475b8a/50996600370.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_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 18240 bytes
SHA-256: 8d3884280364230655e09aad5bca712c7bf6d786d7ec7dca8812385391543b1a
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 10852 bytes
SHA-256: 007f3f567bfec901d5d3b6c69e27640c43aa0e4aeec08be446f663d5c4aeef52
font_02_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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