Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a100c60d5a13e5f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 19:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6c7e88742badce4cb0a9fb2882f71d3 SHA-1: ee3315d7af6b1132701372ea131b80ef65607c2b SHA-256: 2a100c60d5a13e5f08983d5e86c090ad06d47a9b13b0440e31e8c500c73e15cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites under the guise of a helpful document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=comment+fusionner+2+fichiers+pdf+gratuitement PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/298d148390591f54e44b17a5a53da8df/32177365231.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/7936658426.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/kipotipeberasabixebilomes.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12548938203.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb8744a02---96601366975.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xatizilezuxobelili.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/70356550179.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/79202775797.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/61403531812.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a6699e602333040c9a58606efb12a5d5/9183613888.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/87532c4b7539d5550749eecd60472fb3/78490754884.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/n2f31gt230ebseh3u5bgqrbbum/84076293736.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612946b84f61e---49911341830.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/69bfb9c8fa4bb6c3eb0f3eba8e799780/rezesuwap.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/68acc159220890f2a69119dacaa51158/xulevodekuxepol.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d240450af---bonoguxive.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/kitenavumapiwejelu.pdfIn PDF document text
    • https://bursac.net/userfiles/file/85161056408.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/pezijimavajabalokoxeduvuk.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c51aa2356645ed24560d942859e05aa3/94683033171.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/15807966136.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kat4dumh81tl9vbfojkitmmqko/mobikutijis.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/mekibubenabiwamufovuporo.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/81330674487.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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 11272 bytes
SHA-256: 3cf1d9ad8bc1bae0d3b1d4d501e81923368b157bd6edff465e02eef1755251d4
font_02_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 19500 bytes
SHA-256: 9a7610e53c90232b25ff48e6b230882353c9a2d1c1ec92c7989249269814ef6a

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