Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46f9901df9a4a53…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 21:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ce57eb04dbf0f7417f29d3ab7cb58ed SHA-1: c145500b821395837617a1fa4b34295aecf8101b SHA-256: e46f9901df9a4a5376dfdb757a44806c101b1905b0c73fa788039ecad57b9b10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=best+video+editing+app+free+for+android
    • http://novastal.pl/userfiles/file/koroxefu.pdf
    • http://grgct.com/ckfinder/userfiles/files/74338815213.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4fuvmfp2svc536182lgamntgi4/roxitowumesudubigato.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/pukipirodojugega.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/42120441420.pdf
    • https://actor-conseil.com/files/file/gotun.pdf
    • http://chiesamadremarsala.eu/userfiles/files/giboberekugoga.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/77bf86b1bcd9e1851d9d062f79a2b8a2/leron.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f955457de---debesoba.pdf
    • https://selispin.com/calisma2/files/uploads/figukusedifitapaka.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139129bb3bd5---konejarijeku.pdf
    • http://autosoftware.company/autoresponders_images/files/13883527135.pdf
    • https://atputasbazes.lv/images/userfiles/files/jekotasaridunolipepol.pdf
    • http://icmasistemas.com/userfiles/files/xowanepebego.pdf
    • https://rotitelor.com/contents/files/76452782172.pdf
    • http://sdes.in/uploads/murixizavikuxurufurozowu.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a178a1f5b1---voduzitalogu.pdf
    • http://hamzalegalservices.com/userfiles/file/62418790887.pdf
    • http://baovekhucongnghiep.com/upload/files/pufafukixefogosefu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145034c8c9ea---vakotow.pdf
    • http://vning.net/filespath/files/20210909055656.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd28.bin
9a5da45ca770321e5a68bb0fe0a3487dc9fd2f9648baa6dba4ae9ec364b03979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 17268 bytes
font_01_sfnt_off000109d8.bin
8ea2c68451d59241689bb07326bf1d08bcf2be4f7341b54d2f41aee3afff0928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 10748 bytes
font_02_sfnt_off0001228d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes

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