Malicious PDF — malware analysis report

Static analysis result for SHA-256 3858714d158b6c50…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 12:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e2a81e0a9e93a1c4dd0cc66e335aa51d SHA-1: 3baef1beffb55a68119cb80d015e9fc893feb0c1 SHA-256: 3858714d158b6c50c84bc6bc2b78a0e0d8b6e7c629ccb63a46ef67ca05c92ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=reading+comprehension+strategies+worksheets+high+school PDF link annotation
    • https://infotechb2blite.com/bot/ckfinder/uf/files/bafugubulunofajikowezixa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5007eed64---43587099133.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/39154172861.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/ritefigevanedikilobazavi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jozomopapuguke.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3c326dfb39ef55f769995b09805edd97/savovetivixiso.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a65cd7f7---78979344128.pdfIn PDF document text
    • https://digicpictures.com/downloads/6081111512.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kozeja.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/19624842060.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/31183280454.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/xujitijupalulepo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e5733007---xulabajubofakifakipobi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/14486505858.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/vonudinixaruvuvor.pdfIn PDF document text
    • https://kawanmto.com/contents//files/4870904757.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/110538167671.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210702_E45C4049913E99CA.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/jukovumajidabowano.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0334a7bc---85982040674.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59fcc68e3---49697159840.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5ff185248---jejadar.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/tokepudixonu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/83462309779.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 17640 bytes
SHA-256: 21b14056f77720d7ae01488b46f3c1c8eaeed4864fedc13bb13246735664452f
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 11184 bytes
SHA-256: 1bcd6034c75795c590b82c2eaec516feab50d683dc1e47c6088957412a1cac91
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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