Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86f27bdd77dd914…

MALICIOUS

PDF

90.7 KB Created: 2021-06-29 03:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fe7144f3425c70616198fec2e429161 SHA-1: 891c2a41e7b72fc9257046108d257006351327ab SHA-256: d86f27bdd77dd9140ba6df6bf300c85df602aa895776fb70c46285acc53f3c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://dichvugiayphep.biz/upload/ck/files/82173462958.pdf
    • http://aaaexpressheating.com/userfiles/file/dofoxunogukifugonof.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa941ef1d10---jinajabom.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b300cf21ed0---rimofilenafanap.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608341e7367ce---88506088008.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce07404193---zusukavujavujupebipi.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607236412bbeb---jenajilasuwikagomarub.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d75a0a12b---bosuzosisolezosidakirugux.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915b837a9ed---57129129787.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f9fe09cf---29076538322.pdf
    • http://goteneplast.se/files/images/file/dakezasalobuwejujazit.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/repenevopodavilajajazujeb.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/5706d4cdff420796bcc1442e4daba3fc/12601061434.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5c1bf8714138caa05578481245849c58/kajolonezexa.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/79236862376.pdf
    • http://polipack.ru/content/file/44634619470.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e45b2846c---1778639668.pdf
    • http://airconbank.com/upload/fckeditor/file/86083974045.pdf
    • http://citywideok.com/clients/75789/File/taladavewugegoxewajavu.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8b2ddbe8---mefowovalediwokax.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/30637733818.pdf
    • http://fitviewer.de/files/file/19608294497.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4n8ga7908on1rnkve5v3kn2hbm/zunesumatesigibilalanup.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffac5e20f8---welasexukip.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2538cc4da3d7d73747bed9fda5de1ecd/17189356568.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11f334952---kadogolepu.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/66419496760afd10ba7b11.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6cc4f44353e47d9941acb3d671903fa2/30300641605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mango+seed+sprouting
    • 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_off0000fe4e.bin
6c9528ac2e4629adbfb22ed99f9061a9c82a40c6b81db789cdca518baad36114		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 17716 bytes
font_01_sfnt_off00012cf7.bin
e18de5df69ecde732a859dc55119c4deb50ae28f36ac83cd32f295cab7b5da90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 10612 bytes
font_02_sfnt_off00014529.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 16792 bytes

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