Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afe2e0508686f6a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 04:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 895fef7c2119dd5f57117140fba03c6f SHA-1: ebec71f5c5f78e494989e139f37216f092d0c9eb SHA-256: 5afe2e0508686f6ae95c1d81c1c7b81cc0365a2b24c2f71e445253924fcf6dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on compromised CMS upload directories, indicating a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=the+woman+in+the+white+kimono+pdf PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3e4d989a68eb16c58fed1e8a3a85da2e/ripifi.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/80054478673.pdfIn PDF document text
    • http://strandedtattoo.net/file/97733251555.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/5vdq3tvfifvcqbpnov3lc17m2o/mepunu.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/88032155344.pdfIn PDF document text
    • http://beijingteye.com/upload/files/vazoxi.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/sujetotirakojesuw.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/vijorekosefo.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/30388491405.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/zodoxig.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2d4db82e---pikikosisigigul.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/sitetekupabodoxagunazijiw.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5816bf84---53675364321.pdfIn PDF document text
    • https://felicityokolo.com/file/winukorefomof.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rh774vdfk4onh48vc37a6d0q60/vuneruwadupedoxusowazal.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/47457647697.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nirarosenokejisim.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/50320537495.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0410f51d39e58a85b8ce0ea1116d6a1d/xesoviderupafin.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/duwodubamowozut.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/10670312587.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/zovenusimibaf.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/vexopa.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed48aed41---fasozubepifa.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/40626223930.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7cc9c94f---7172738791.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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 17312 bytes
SHA-256: cab38c32de0df849f9fe9ca2be9dcc15313c039971b5286dc4f4ce3a5d5411a4
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 10592 bytes
SHA-256: a987147ecef7d5796185759f74aabb7a792dabf648160772897e3dff2dfafa27

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