Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d87ad31c4b4a09…

MALICIOUS

PDF

115.5 KB Created: 2021-09-05 07:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85fb967e8275fba8573ab04b1b5efffe SHA-1: 0515aeeffff871c42e79ec7913d471cea133635e SHA-256: 99d87ad31c4b4a09ef86c1b74c0feeb6f9221af2ad8cec231127293262dc8113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qns0ac3h0jn2creq3guu2gj74q/velulez.pdf In PDF document text
    • http://weorderfood.com/uploads/files/8260840898.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/12c05021345ad22e003e192913af5e46/kirewivegedomowusiju.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3584813cfe53446a7dcbe4bb7f3c1984/xafudub.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fcc7e3cf---4827795079.pdfIn PDF document text
    • https://stauber.lt/images/files/kagetulubalawikoxasuniwu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2934f975---45448574700.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/pebodumutubemim.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be83a2b121---29159209285.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/fujokosevibizolopi.pdfIn PDF document text
    • https://anfauglir.com/images/file/98208780796.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/18450866834.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/mikagizisadukimuzutowu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/09b696ec4d357b0d62e3912cb5435a27/sofogasetemoliwo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe040bcfa4---munigibukebuzose.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086325672c6f---wixasipozurebezaxupawi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210804/file/guxobogapubezalefax.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115a72554435---91714049074.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108211841205387.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/fasan.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zugigujufosesu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/30326549383.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/togitigok.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dorabomigi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ca8b0a3c1b9b71d529e02f7e06b413/sewonutulikinudavozuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=crystal+report+9+tutorial+pdfPDF link annotation
    • 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_off00015a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AB 10800 bytes
SHA-256: 9d21c59e2caa63b75a549429814db21a8e7a5ec5e24164829e87b1013263e9f4
font_02_sfnt_off00018bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB7 19748 bytes
SHA-256: 22e03b43a25de3d8bf5f6971ce360c632903d037eb2110ff23489bd4c9840547