Malicious PDF — malware analysis report

Static analysis result for SHA-256 58243dd718c6ec2c…

MALICIOUS

PDF

88.2 KB Created: 2021-08-08 08:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ebeaaeb1b025c15326e25edd2bf9a9a SHA-1: f3a06c7ed2ccadd0630ed2897afa7ea8e41e40cf SHA-256: 58243dd718c6ec2c5b6aa6931bdb10a31fa340a901a63be345340255d1d10229
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also features a large number of external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=independent+consultant+proposal+template PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8cd3be3b---85489723997.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502550a4f0---190341495.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c057337817---82039910969.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8ffecd0d---42519610626.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/pogibemusakipu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/68420222975.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/67714680554.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f46426157d09afa94dacafc9652ee210/85835840208.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ec65f55d3ca00178b8ebafbddc6dd1d4/jalurizajeneg.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/guwokinodev.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/20096160346.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1ef03919---posiba.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/f3t0i9mtch2rtgrhud54mg2eo6/40683577861.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/dikexijino.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0o9rrf23cablu1017b0h86ud0d/kurisi.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210528102934.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/53aa0771594db09452e9d70de3302c06/wumegenonasuvisot.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/35829044751.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/dijasoz.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kaposerazuxito.pdfIn PDF document text
    • http://espokebar.com/uploads/files/55972254625.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.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_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 10636 bytes
SHA-256: 5c2e3751e8a89ce967c3f3675fb7ac720df058ee9046521a1e55bab10bb046db
font_01_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 17932 bytes
SHA-256: 8a8f07f26bedc9ca30cbf26d23023ff08cc2d91ee3fa7fb01dc1400da55c1dcd
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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