Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b053896f707314…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 23:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76cd9bbc46f38a4fb781cd48c60d713f SHA-1: 8b620adbd7691b6cdfdcd1a51c76471b2ec6be68 SHA-256: f7b053896f7073142d6b95f3e0a11cfb576c65bb1ac911a6a0b2d18ad068f46e
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. Heuristics reveal the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://oniceh.ru/uplcv?utm_term=briggsy+sea+of+thieves+guide
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e2108cba---miserepotibuvobuzawuvirad.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/mipotenuvu.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/3067019278.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/791dc80ae6a2975fb4c4524a7c895402/kevom.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5f3b164248cbc588576bbf930417b550/92887993579.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uhbojr9799h2kol9s1eqjcuo23/zutawolumami.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c0i44plvhlb5kccpqeie5h6j9u/fusepabumererelizeke.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084b089052c9---famibugixe.pdf
    • http://tai-yang.tw/taiyang/upload/file/dovinejarijosukikevebumu.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s5kvsvvp5dtvqrfron08lsc5i4/kesiwukafuwavuderese.pdf
    • https://grupo-kayros.com/userfiles/file/92787759569.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d96c708d8---xizuxo.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e9c2eb7e90df85ed6a2f8819e65fea5/54557669687.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9afc02240262a1430426b3eeb57c0ba4/77972976159.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/60dm4u2st30el2berbflit17hg/15559817303.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f47a3f4b402b25a1ca7de10352e00b88/furumebunugomowabekukug.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160867650a80cc---94385284352.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078061206b2c---tovivitu.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e4d987af8b027326e0acec39bb40c486/12344221379.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/65r9l6h7be1jd5vmfvlcrtbp61/solemubizinofip.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e749aa9e65---tevojes.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608082bf5fd93---takelo.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9u62e6c21md2qpuihgbfujh210/38252588638.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dqpom6otljrvabbfq3mqog5pgg/musivu.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_off0000f6a5.bin
0d915387d4d89d787f597784f4c166867c0302ec1f52bfb5440e7961ec4fb314
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10816 bytes
font_01_sfnt_off00010f9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 16792 bytes
font_02_sfnt_off000127af.bin
350ed69d1754e374f3e5ebe0ae6dbad27670e3f46a4cb53ec343e64162972d46
pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16756 bytes