Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63b917cd3960f91…

MALICIOUS

PDF

75.0 KB Created: 2021-08-21 04:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4b806db6c5e01e8bdc34d1bbca21f72c SHA-1: 5bdc21a2d71d5abe627f61ff9a58076167af3932 SHA-256: b63b917cd3960f91bc5d400f13b614189ff839d6fe1bd3d14545c917b7210f10
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a10faccb4caa1634bc7ae16a7e25f35f/49962745601.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/da4bf7ab3277c2bbdc23ad581359adea/zezifavibokivufi.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/sowefegu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0774197f2---12677095024.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/sosoletatutaloxeneni.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e06c89f3---laxisufuxefibajaxaxoreru.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6043344a32ad7b010f7629d4cd1e7c03/32697150374.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/41097966750.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/widijorenofe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f78160687---93295308471.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/2039171533.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/runezedu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zaluze.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e367e39104176a495d9d46990ad148f/bozosivudavikejiju.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/679732999.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3bcd1ca03b97bc43d7a20ebe29c3053d/36698497106.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a907e038aaf---7956933604.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/29803656648.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/n19hcobqsfjq96om5j3q3725i6/71334360578.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ca491c73ce9aac670b6e008eba1bff0a/15298019519.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/12966083956.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jimafakidasobuparup.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/15604901689.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8c15a099819b76c68c9faf56ef525a49/51518916895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chapter+10+dihybrid+cross+worksheet+keyPDF 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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 16136 bytes
SHA-256: 2ac3635a9012abf494315dd8b4bd36be944919a9d03a2b2b07d0ac17052ca239
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 11100 bytes
SHA-256: 16072cc2abf7db29b5c7261911a233214e6c634bdc8bcae19e724ad97448dcb1
font_02_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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