Malicious PDF — malware analysis report

Static analysis result for SHA-256 270dd07cc9a232cb…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ba7720d9e702c56f58fb9dc84222f03c SHA-1: c7c6402af6310b0a8748fef389262e14cc97754b SHA-256: 270dd07cc9a232cb2eea98e4cda4633136dc675c30b9d3b061ad1df1ecacd0ff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm for SEO manipulation or to distribute further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=optical+packet+switching+technology PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9d90a3406157904e525d7895c1e53bff/51808946096.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n4qcgm9pg5bes05tdejtac6oo3/ludifixadelobadirisikuzo.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/sovunitubejikom.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/xelaginezoxonub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db182b8618d---botesuk.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/tipezipukusudopa.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/862a6732729c6d07d245cd2d5ca92910/17449009104.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b9ec94f8---roxotid.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/jizogefuwofeniras.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/47089152688.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/jinabid.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60cd9d3bc5---vivinako.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/23929079045.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/sezuxewekobukuwop.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fea39401c70979216a28084441475a90/25583705907.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/dulekajafetobeletajiwubi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c0827d4cec19ea9247ea3acf6d99858e/duxesonajatufusosanuz.pdfIn PDF document text
    • http://allycatering.com/userfiles/zazamekiwijavoba.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tinit.pdfIn PDF document text
    • http://klinok-saintp.ru/files/xogugunilesux.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3774231b1da1c92c6d91431bfd526d67/wadepaj.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///74909803897.pdfIn PDF document text
    • http://candientushinko.com/images/file/funipudisagib.pdfIn PDF document text
    • http://abnicum.com/files/file/96148181568.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf68c2f694---91500970592.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_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 17416 bytes
SHA-256: 27bdc8997d8ed5ac9a3d1ad470634103f5135fd204614f3804fcb6bdfc40d819
font_01_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 10872 bytes
SHA-256: 3b44b21bd83f4d4a6e8ba7523670d14994a59683a8fb2e0e0066cdd1d5071d1c
font_02_sfnt_off00013718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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