Malicious PDF — malware analysis report

Static analysis result for SHA-256 1757ec37f290ae4f…

MALICIOUS

PDF

91.0 KB Created: 2021-08-05 05:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f58c1d0b8a5e032817bd9daff24ffe1 SHA-1: e8c0e446f6b08112de7bef93cccabf5aaa764132 SHA-256: 1757ec37f290ae4fac06b525a272131d3359e2c9cf2ec0ce165aeedc32a14e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or link-farming scheme designed to redirect users to malicious sites. No scripts were extracted, but the presence of external links points towards a potential spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=how+to+adjust+huffy+sports+basketball+hoop PDF link annotation
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/29f71a315162b4cc21fc2d3530ae61ad/najewobumebubisevevuxe.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/rafibexibu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1507953b5ce42bbf70b5e550e0cd545f/71168869578.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/90767827007.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d26ec116a---99842927733.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/48620d5959da9c808d6cb7b6282b54ec/begovakimulesuxeruletima.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c4a111e46---45990701169.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/25445494873.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dse257ja0c1bjebggf1q0hpdmo/84438711962.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/neligatufemanomuzoxomuga.pdfIn PDF document text
    • http://berbun.com/user_img/file/11601063223.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/86123235636.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084168059561---gifogasiwolibi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ed8404ba388204afdeb9b2d7ff8010fc/rurovuz.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/sabigefujuzenepopavosi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/30f9aa2bd605ed575ae4a35112e4942b/limoniwibafufu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a41205b814c---powukikanufakomegotopigak.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/72648250419.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/81c4c1c5bfae6bcfd92aee7b6af78afd/80229481670.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/112f86126154affc09cc7f2795e8afc9/nusajobenegidamuni.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/33690039892.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847695848a7---labebojimumemafima.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/82739344965.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_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 11052 bytes
SHA-256: a1559950b7810763783ca66c8a7f3b0dd99811b2bd1cab9084c11aceaece1053
font_01_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 17124 bytes
SHA-256: 016fdad89bab2c3246d226623da7e217576b9da6207f0b2764954d6c04e4ff8d
font_02_sfnt_off000145dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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