Malicious PDF — malware analysis report

Static analysis result for SHA-256 453b6e77dfe4b2ae…

MALICIOUS

PDF

86.2 KB Created: 2021-08-12 03:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77c65700246093cd26109a3e500191ff SHA-1: ffa543f0b3702ac2978de29ef5e19fe5fe757a6b SHA-256: 453b6e77dfe4b2ae7bfd5cc40f6d87ed846004f9b0f69a206d755664a91894ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+to+convert+word+to+pdf+small+size PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160873b847971b---36634922033.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/zonisumewivowovexafusesi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897eec4afba---nusikasa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cc62ac66e9cba27b2178e3e5904c3e1e/63695784641.pdfIn PDF document text
    • http://abnicum.com/files/file/rulalupufof.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210730164523.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/74b1e3eb2c720ae4a99054ccfe8e41de/7319683312.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/botufamefifog.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/46876463697.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512519f74e---mevekaduzanuxez.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/92689717366.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e656542863---46574594824.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/71811558182.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/58886207626.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/tuzotezejubowosedux.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/vogovofefowezigebub.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f471191a43---97711073906.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210624_3B9C8A56F64CB87A.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qg4hcmlf3es90e61isuckghib7/zulubemo.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/guwumatojasapufaweloloxi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e9f8417b21ccb43bb179285f83fcc60c/8054492529.pdfIn PDF document text
    • http://thedreams.cz/files/25790819399.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/71113779663.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/vupozewezonibijubuvazoni.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_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10984 bytes
SHA-256: 190de21489ef346f802ec6a8d3e884a6e4369681b44b91730ec9c92c55584c81
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 17100 bytes
SHA-256: aca561dcf74488bee25e658cf925d088f22911c86ea3960baa94fbd33d90601e

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