Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d006aaa3e19e5b7…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 20:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 589faedca9a77516ec595e4583935fc0 SHA-1: e8c9905b62e57ed97d0361b00e358b138c7460a7 SHA-256: 1d006aaa3e19e5b7aed823c1d4808b2c305308e43c18b243fec1b14bb9b87a57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

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://archism.ru/uplcv?utm_term=diagnosis+code+for+lung+mass
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9bb629eee0bfd6be34ba310912e793fc/94506020191.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5de4a7e0819c5a03a7a17d463f5b422e/xirozufemifonodibupoju.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/18476424191.pdf
    • https://247hvac.ca/fabulous1/uploads/files/leverudug.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c91d0f129---xowebar.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dgo9f040qrbg6j4o388h3oi31a/71059677418.pdf
    • http://amctop.com/board_data/editor_img/file/202106241943.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768fcaa2019---6172579703.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59f7e6369---73185282584.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4ouuq5vup7770l1m7jkkb53a3r/42522376226.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ec9bcffc016b43f4980b3d1968e48b3e/kixagijagikokisofaziruj.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a278ca9099---wutapitevikutuzujame.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30ab13dd4---70839070073.pdf
    • https://gbagencement.fr/uploads/file/pimud.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715521efbc7---19985512651.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/02o35o914n6lspr21qrtpttd99/18284182101.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/457fa0efdbf466b1a67816353c896d99/liziwirefafotojikuvopun.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e943e8f47ab036c893ce98fb594111bd/sajog.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ebd802e0---73538161388.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25a44439b---zekugepazenawalujufuka.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/501cd6744dc28f931e0d236db2078165/zojuvofakagejog.pdf
    • https://speculatio.in/ci/userfiles/files/kalavuxolurenibi.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5afaep0bqp3n2ard7lgvfm1lus/vexeguparug.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f8a3166beab7baed4633a921d5bf934/77412585790.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d6.bin
652b027867fdb94d0f5dfb2c0b06773fdc5fb1025c45614c23b6457398f1cc4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 16288 bytes
font_01_sfnt_off00011ffd.bin
4bb8874ed5531159f9037cdad7acd74fe25006aa0d4f9a8f758d05f8ef05ad77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 10820 bytes
font_02_sfnt_off000138b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes

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