Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05350b744fe2a47…

MALICIOUS

PDF

92.8 KB Created: 2021-09-02 09:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bbf025f2c8b8e31b13d13b9573873a9 SHA-1: 17edc5d57fde6d7c5d569c0e8fc67b1d177e301c SHA-256: a05350b744fe2a47b2999d2704eaa990f006615aa484b203fe4e8e64fe0a09c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=how+is+your+day+going+in+spanish PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk66o9n8k650b1hm8oi34luq6k/wuwutelejuwunasar.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/mapiwaxijil.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/68868057235.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xixodu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3382ab753f---13203020324.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4f5cb546---kadirotezaxototezege.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/gowiw.pdfIn PDF document text
    • http://vce34.ru/attachments/file/rosudebivobemevif.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9mg9ppu67fq5pm49s0eb4753eq/fevunefadixanorujepadep.pdfIn PDF document text
    • http://yuhongzg.com/d/files/10311246785.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7jk5s2jpk8cr12bsahlph2r798/15922077391.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/21259722932.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/lijolanalapojomelon.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8aeb488f6c569811c29e96aed9359341/92276584061.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/88032538148.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/19657259757.pdfIn PDF document text
    • http://apismorava.eu/docs/nowumujepus.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v2t4ulk88eqsffr53civeegeb1/fizunododimobi.pdfIn PDF document text
    • http://tcihk.com/userfiles/tozidasubuluperilamak.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/sibof.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9afe567a354cff44ba3270f98a579f3b/38821497876.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/50992985437.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_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10688 bytes
SHA-256: c4ea74240ee6acb3cab5db32199dd5fc09b7532f37080c8516ba4a8ef42c1e0e
font_01_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 17376 bytes
SHA-256: 6f32edcb2b7ba71230833fbf2a667a4103167ac5568985a6b71799f2390577c5
font_02_sfnt_off00014c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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