Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d159ccda93af47…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 17:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b59031f63a659f10ff04a4743bfeb8b SHA-1: 90fd59098c684d7da78d438bf65d7600412390a0 SHA-256: e6d159ccda93af472c57c7e716d733bbcf4fd84d6fa81b024ee1d7ff0a8fc1e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of numerous external links and the heuristic firings are sufficient to assess the 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 https://nikosdimos.gr/userfiles/file/diruwisavofel.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/lugele.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a036cf6011a---vopetubutesafefixikol.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sj478vccrgi64sf25c1mtj2ch2/mudogotuvugadanufe.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6937af89cbf200b238b06e4c543bc00f/99238057216.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087156faa18d---38350989251.pdf
    • http://adveotec.com/img/file/80213125112.pdf
    • http://accessiblevehicleservices.com/userfiles/file/xofuputakidikevinubekexuj.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/3402285392.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5e1f8e90c7b24b455f96512808cd8c4e/tilipupidirugibevo.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9303a29e8---vutijusuxewitomuduveziwe.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608859ec726a2---10179179947.pdf
    • https://glbtrader.com/userfiles/file/wamikaxalip.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e2e1ec65---97348666907.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0634b768---39301195154.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa09995cb---89398791600.pdf
    • https://vanvoorst.info/uploaded/file/gofar.pdf
    • http://alliusie.com/userfiles/file/88009390003.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/denalipugilegepebopilu.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/suwizakimuvomasafag.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc97c6f50a---73153641313.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b3d121080a23ac5ca23313ea5fa818a7/82828804574.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/71665146314.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/60fbe407e0772b7e78770017c38106a3/napurenokuzobeb.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a7f27d08---78312893505.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d89968c72---xagofuruwetujatu.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/gadugipik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cooter+brown%27s+seafood
    • 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_off0000f46f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 16792 bytes
font_01_sfnt_off00010c86.bin
06e5b994ccbabf24caf2717d59547cc52a44238f40d1063cc7cf5a8d2adb3641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 10500 bytes
font_02_sfnt_off000124af.bin
a45b3534e8d8f456d352e301ac06b0683cd1113d340ff9dcb2e7fc8cb80c94bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 18364 bytes

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