Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc4bb3313bc3ffa…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 21:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9a62dfd3d63bf65d98ddf6515fa06d42 SHA-1: 0ca7654a57eaec26125354aac50958756d980f62 SHA-256: bfc4bb3313bc3ffa33a3682b521157279a1300dee0deeed3809525abbba68350
156 Risk Score

Malware Insights

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

This PDF 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 pointing to multiple compromised WordPress upload directories. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised sites suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7b33ecb1---sadatipanutumovon.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e2c1e6a1ce3259aab224e3662134d71/98547456144.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160965c3012566---jijagugut.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/54087325536.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/h51p9rrh71f4m3nkr0n2qgfgrk/76586081338.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/62205095340.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/lovowefuvogodukixikukuge.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/290d30a2aa6bd24be59a81240f821385/semigir.pdfIn PDF document text
    • http://sushi-belovo.ru/files/bovipowaxodegigimexabi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee94dcd68---4590099570.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e478c3b43---fadowugufuloge.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4592bf7ab5471062cbbe1e5816e01edd/kezefusilegejedopawevejil.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/37239403944.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160762c994f5c5---37082920089.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/36126808797.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b02ed5a36---regugonemilutinodoriwu.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/39238821169.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a9d4250166550cdd633ab27f155f3c40/wonaxajekiwokanoxigifo.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/34761158447.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54717066348.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5iltfmd6lgo5k9c0dpm1rengb5/zapujatulif.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/55830195353.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/c959e82806074e2797a1fd5224e3238a/53428364930.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/wapulikumexoxopa.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/zezewinidupezigamud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=warming+of+earth%27s+atmospherePDF 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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 16840 bytes
SHA-256: b0d94f1628164417a1d50c9d6434314d6c57ce0e90e0e1d24b8f1f7ed8af66f6
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10784 bytes
SHA-256: 7defa8ece2dea2df8bf07c0b9675d1e589d6356b35afa796c359d869e71b1c4d

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