Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e05d0faf97f5cab…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 01:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8617e4a13a2b7000f5d83dc52b8a260 SHA-1: 1da4a599496e3486ec8c1c903ff02b2d40bc61b9 SHA-256: 4e05d0faf97f5cabc4ea30acb0feb23c965a88f7d9dd75572404489508f07e3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=the+killers+when+you+were+young+lyrics PDF link annotation
    • http://fioredda.com/userfiles/files/9566719264.pdfIn PDF document text
    • https://hgb.se/filer/file/27161545961.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/sazojosudafunotexamezus.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/05f4c2691490f29c240b0b5021c3ad7d/nakisubulav.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/59c93e001c73d4183ee92c9b227b6011/fegexuxazopi.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/26265251562.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/volerilujidisofifolus.pdfIn PDF document text
    • http://takeacode.org/user/d41d8cd98f00b204e9800998ecf8427e/file/87380388081.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4o5dapgq2gla8n8rn8gcrd4f2o/65486029926.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e0166b2e8---muporijufegejemivemumo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bbac866606a0c845b15bfd8cb13cd0cf/39615524542.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071342be2b0c---bovomux.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/16498925156.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/87037383215.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5144a70bd---58011614071.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jililusanowu.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c73395415568a36730f61c8869f381d7/sapepotepepolesepumi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161235ab801d5d---17580170087.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/vipalakotudotomagan.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/fujax.pdfIn PDF document text
    • http://moristas.com/userfiles/files/75576102676.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071819174027.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/98477269101.pdfIn PDF document text
    • http://hrudolf.com/userfiles/67772919023.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/21847231472.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 17708 bytes
SHA-256: cd6c19c08122aa8b660f8134d3f3c5db6fc299c38b2116725ddebb3eae1c83f8
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 10604 bytes
SHA-256: 0a34191b7e5d19023b30b63bfcc14a6b6d0c3d13db74d633a8eb7d569d7f0a27

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