Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0b619dbb5d2f55…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 00:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 24fc935adc730604165b5d59748b42ea SHA-1: 504fb04afe4ccee4fd55d52f90f205249c4c2ca1 SHA-256: 9f0b619dbb5d2f559b6cbde59c2df92627bf33207e6604a58a31fe8d98974114
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=introduction+for+computer+project+on+java PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e1ghug60k7sfpqk3poh9mjdmi5/72651144702.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uh7gk37mfif1bq37ipvijla1l6/doxizegefefafev.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/68759506332.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/96156769949.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202153092235556.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/d4ojutlrr230ktnq0kaes48ltj/diborirutidebira.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9f57723bc1a85e02cef22ad1e45be764/63365652621.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297426a276---zizizofoputepew.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9291285e9---45433277080.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f880653b2---11338415113.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c0342adaa0c89c2b3f163d968f0466ea/75585115012.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/sejufuriziguzafejokixafa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a70b292b8---95230091934.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af314198f5d05715677757a2f04b6118/86974389072.pdfIn PDF document text
    • http://gdaniec.com/upload/files/pufuvobamovabamezekasel.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a0677b16---38660979258.pdfIn PDF document text
    • https://aashianarealty.com/file/gixexomuzogit.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/63075468247.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/jagepebawarelopuduw.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/54l9qshas3c6mr9p2lmduhl1fo/takozumav.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa33d9f2f---41883000394.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2aa0f8aef03f6ea5fa8e692858798003/fefagimamutepibavemenesag.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/41b17452ea71b3bc2a992f0152849eaa/sadomofemaro.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5c28cd641ee9fdf3d87bc8da49ffe8a0/kofinejoxi.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_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 17680 bytes
SHA-256: 6f2cc4c780812d6847fdfe4c59816a118ffad30e69b18757baf8a155b5fb1bcb
font_01_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 10816 bytes
SHA-256: 0ed49d765cf5574d924b22a2c1b567487daf3ecff4de1a03054c2ba06f44d492
font_02_sfnt_off000145a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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