Malicious PDF — malware analysis report

Static analysis result for SHA-256 251f0a1816d60c7d…

MALICIOUS

PDF

94.5 KB Created: 2021-06-14 13:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2c8d385609806d56b0e091a90de0c54f SHA-1: 38a1dfb8cba1db50c37a48be30b87d64a3fc548c SHA-256: 251f0a1816d60c7d3b7559d5de8e76bafdf6e202460af2f67ce47addc868872b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=std+12+economics+book PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dnbn00k0do1n1hu0rjhdqfbh11/punubixigigizagoguvo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5af7051b530dd7d2941a621dac4c1560/mujezomekanigosinik.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff1c376d5---nukepipuwanopojotodajamax.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/8986078644.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e5013d55fad711e86aa0f4fe8aba5f78/70002622068.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/73086162047.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609122457b34e---57972272182.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd9ce1de2---mavufibejejowe.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ab0cf144a8f72a08dd3d85fbce78b8e/mozume.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079399932a0f---dewevoroxuxeraxikun.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/41us3788l0fqaq4659gi0i15t3/zijujuxedabuz.pdfIn PDF document text
    • https://luminex.pl/upload/file/96411595512.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac55c9d167f---31350485721.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cpmadusp2iv0r7gt027tqdddpc/88975187087.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823f2748699---palisesotubiwugexes.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae628b5285---sinefudavubawifir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 5240 bytes
SHA-256: 28fa717e0e606556f5e484af063a6e19d5eb881b8178ad975e3688aaca5af880
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 10532 bytes
SHA-256: 4e9e0b655bf6d18c9c5785dfa2ada552c57038047671a2b7f5876be85ec92cf3
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 10672 bytes
SHA-256: 49603d331805d956f2d2860df9b2fe318530f0a3d800aa99ab6728cfa3afbd53
font_03_sfnt_off00015787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 16096 bytes
SHA-256: 43254c6337662e76ed67025008a42d76121bee43b935a85a5f582473253d5118

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