Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d1d48a7cc0f646…

MALICIOUS

PDF

74.1 KB Created: 2021-08-28 05:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4328812dfe3dd0842e3d043d181a4a8 SHA-1: 7110f806a3ee1c80a585e44a08545d1f9c7bdf99 SHA-256: 50d1d48a7cc0f646b670b5787589a6981f4f3f57a8aaa77b0aa53bbc69571330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=give+that+old+time+religion PDF link annotation
    • https://radmangroup-ye.com/rgfiles/file/28974139013.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/89002539608.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/13535202558.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/pupiwisujapo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1610a71b1229e3---73534202127.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/307eb0b19cd1e88e99553c4b95ea4ad3/sekixix.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/dogoxogujepu.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210716235438.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/totuxitovaku.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dec65fde6---88851542509.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/95967812295.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/dazodavade.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qi4q2f901mvpt440uollqvaehg/79241850609.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729fa94182d---85169228591.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/ribixelinawubaworeniwoxek.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2bf887a07---37344958274.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/17266194504.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/76745819910.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/jifekoresebizof.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kamabebetozejominu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/28195265656.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b49de89d---fiwajubowibumefegizegaxop.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/weralimikazegujowabo.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/81045366097.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_off0000bec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC9 10632 bytes
SHA-256: b3248b4ee2a11f5d60730b652ef435b8871180e032b941a837f08700bee42768
font_01_sfnt_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 17196 bytes
SHA-256: ddcea355862e45e5af68fa1a547fe8dac10dbd5a95b44ceef39f56d5fa1c4cf4
font_02_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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