Malicious PDF — malware analysis report

Static analysis result for SHA-256 2456a68c36fd7da8…

MALICIOUS

PDF

96.2 KB Created: 2021-09-02 22:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae2a2968c2f2e3796fcfee825a251c9f SHA-1: 7f547125d8448f549acd75e3825239b629639fd9 SHA-256: 2456a68c36fd7da8d79c850966cb56a549d1fd932ae28dc8ec1d442dff41d594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest potential for JavaScript execution or other exploit vectors within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=avidyne+ex5000+manual PDF link annotation
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t6glaqo4msptbv72n0np07guq5/55407094088.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c6166d6694075d325f42d6d388ff054c/papajabikowizusedine.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/645a034d697b8ff596bf410dfd49c837/xuvirofonedotul.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7m8flmorjdtlfbfl8sta85dk71/xureto.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/xivilitavuwaj.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/vegalufavosotup.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/68143b3bd141fcbb3d9b8cead1aa6112/xifesanagovopajipopufik.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bd01f4866602a94ce44189665efd2ab/92809783841.pdfIn PDF document text
    • http://artside.org/data/temp/file/vadagu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bfa9fe23---3924441172.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b6ac0264d97f319c10d056469b12fd4e/zamutaguxonilejatajera.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9a2cd52f5dc19da81511c5bc67fb71b5/1299235044.pdfIn PDF document text
    • https://ms01bet.com/contents//files/90399961336.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6abcfb7c9a---tibuji.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160925cf3eb039---53986331508.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/52254825752.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98daf45ca7---kazelif.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863b494eb37---veriror.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fabfefcf37f---zorezofinufagavoravub.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4cf5c30063f3594a0c52db3735d2d278/jokadowiturafenuvorejode.pdfIn PDF document text
    • http://odumakus.com/uploads/files/10630465761.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/zexatutataxomidiletebopi.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_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 19552 bytes
SHA-256: c09b3bfe8158958ceada659a21b03691c1d2200ae37be13036f3e2d95c38d47b
font_02_sfnt_off00015b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3C 10544 bytes
SHA-256: 4492017a473acbaec102c69dc0258c6532a8473219799dc54ebba7ae9ba2a25e

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