Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af604d10516804a…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 04:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b8cc143225d3436101a8be456ca2f63 SHA-1: 5edfbae72c5b63355e3c90d6b8d875931ce4f500 SHA-256: 0af604d10516804ab8b08e330f4ce294fc422ecc9a8056e8ab2c17cf6dcef274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=writer+of+a+farewell+to+arms PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160859e802fb35---88401270938.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29504cdfc---lafewi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/68b9993f89a2531c30eb218493abcb61/30251216910.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/peziwulamatulijawofid.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/9082845266.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bvl45uduqia83m17dllaqar8o4/ponesodokuzosilesanu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/16063555714.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/3924049519.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c9eb36821---pozoziriboru.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5b53af0e---sozugab.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/2304940965.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/12027763205.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d500951f4---66679707088.pdfIn PDF document text
    • http://robbes.nl/media/files/13369566517.pdfIn PDF document text
    • http://kasargod.net/uploads/file/79255848822.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d7c148nplh6dksmhf4m5196hu3/54531586959.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f27b02935---piposadowa.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a51780c2d84---sivumefesebibudimo.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/17723270327.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608226e283fba---27109744578.pdfIn PDF document text
    • https://advik.net/userfiles/file/20891289644.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/39336607508.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/69603718738.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/kotaw.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f6b8c015---84002963161.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_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 17796 bytes
SHA-256: d430abe41da15defedd404ed3d15c62fd74e1e1c9d18ddc99fbd489d4ffb643a
font_02_sfnt_off00014e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3D 10352 bytes
SHA-256: df328ef01da71cc7a329efeec627e8aacd2cc480ac437c349a52cbc3d904a6b0