Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7da6637a144bbf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 01:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a76a1377ad2e62bb36480b7ebb0b5c00 SHA-1: d39b4a53692477f8381d2243b05c49ba8cbba83b SHA-256: 0a7da6637a144bbfeb3c35233617caca58849222620ea41f98f402210e1fd52d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and disposable hosting sites. The embedded URLs likely serve as lures to phishing sites or further malware downloads, consistent with a spearphishing attachment attack vector.

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://catamma.ru/uplcv?utm_term=us+national+policy PDF link annotation
    • https://melz-feu.ru/upload/34960268076.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nepawopiburetulunoxija.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/jugiserunidedamat.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb292bfabf---vugojewudamolevewepafol.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/bezunegebakidufevipexiv.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/81158355158.pdfIn PDF document text
    • https://tmtteks.com/files/dojopunexuwinedewesa.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/959af065827ecaab51eb386e102ef109/14554336347.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/43794079132.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/86874755923.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/gosiwomesumilonejukogu.pdfIn PDF document text
    • http://retrofotr.cz/files/file/webafeduvolubezagojaki.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/498ebfc690e9f636a055426373a62281/32868524968.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/peweke.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/jetumasusalun.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84e95cde9809aee324b5efb2c5f45c3a/67004922969.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/5330139518.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/gikabaloxonotabasokope.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/79279515809.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/kanazajodutokodifimok.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/91842771522.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/wasepomisewezala.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/67685505572.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/20976812338.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/76764073605.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_off0000b579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 10256 bytes
SHA-256: 37cd5b4b0384e0097182a55f66210c9bea54c2715ac6d9ae08087763e537e0f4
font_02_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16512 bytes
SHA-256: f5cb5980b6f4840cbd0e32bedb07e37057c74905d1cc18da6559837f5b9ba426

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