Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8d0cea62508115…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 04:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e08899ca34955114a342d966f7965f87 SHA-1: 56f056b1adc83c4b78915372f8fb7e25083cd231 SHA-256: 0c8d0cea625081151a37b4f7689fd4a40a167862a8ae6bd67f5cb9d44fc465bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. 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 'utm_term' in one URL further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=basic+accounting+multiple+choice+questions+and+answers+pdf PDF link annotation
    • https://soechi.com/userfiles/file/rutadoxi.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/rudan.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a4419cb3---37728832444.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/k8qf8ld7a5nkijj94l1a5cmr0j/40528018174.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c73ab54a64f---7898538801.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db210d8022---zofaxufugozikixuvir.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe06956c93---99341098262.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/9483926627.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/34784616389.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/157b0b70e6793baaec5c138a8ca25c75/13931821707.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2f33aa0f6---47655316996.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/823aacd37c6b6e23c70d16cef9b15ea4/88413204146.pdfIn PDF document text
    • https://tdfstore.it/file/37573812474.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/87607571358.pdfIn PDF document text
    • https://aashianarealty.com/file/16145129441.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c58c9412695c7e065d552f6811723327/68439294411.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/zuzasonixemewob.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d5f28907---mubeladeje.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/acfcbc5f328a97cc83f324f33110730c/vudaleludakob.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3f09aed7---nitabitajasetuge.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/742c04282fdbd399989889eb8f6c1aae/20859025876.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5a2150dd66bdd5ef4d3d99958d78ea53/80007411236.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/lefavoseropiduf.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/tugoguruxazixazovis.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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 11452 bytes
SHA-256: 4414a390c5222fc6029b7ad3f44f9c22070ec1328d6ffacdf7aabdd2d4799bfc
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 16900 bytes
SHA-256: 3908cab110ef8b4e4e9ecd3a1e198c3bb818d51f44ba912905c2096e3d49224d
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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