Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdce3d023a7f0556…

MALICIOUS

PDF

78.1 KB Created: 2021-08-29 05:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ede92741822555aa468db59ee2f1ec55 SHA-1: 8ade7c21e77f02cd93bf529475354bc17be0c7bb SHA-256: bdce3d023a7f05562c61545103cfcc2c1c76be6e1a42d6e38b4384f16a93081f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The structure suggests a link farm designed to redirect users, potentially to malicious sites or for traffic manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sarljarry.fr/userfiles/file/kakegixinutevumupipikawo.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bn694gj05cpo60dgt4078nq9i4/nofoxi.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/86005721060.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/76c2aa5d5a2fd98cd2575855cafd3bf6/47929060252.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/musuwukesotevaxedeziteset.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/dikekagomazupolevowuxem.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079875184047---85531682824.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/55322013184.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/rarunom.pdfIn PDF document text
    • https://ewt.cz/res/file/mukerefuk.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a396dd011f6---72019945044.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/07585b63167b103204be733e0b2c4a12/dozefatazinokidoz.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/24923672554.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25fa8ccdd---nubukodipuvuropubojuvenig.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-20/20210820004319171197.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/008dcd93fe04ec5e162886dbf672e7b1/dopetudiseris.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160845acc33c3e---89921665915.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/30797482858.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/530f087681a4f0f4e6a2bc7a0a93e900/kagiwatonanomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sims+freeplay+lifestyle+points+hackPDF 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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 17608 bytes
SHA-256: e94c4781d38077a1ba87480d7f313a6021dbd76e9902df80968c821745341e4f
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 11024 bytes
SHA-256: 1041ac779633179d2248a77d5aa60cab5e40c21bbac680195c34bb2ec1d6932a
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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