Malicious PDF — malware analysis report

Static analysis result for SHA-256 17110872c5d4f8a2…

MALICIOUS

PDF

92.7 KB Created: 2021-07-13 19:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9559f6c9013452823109423ee10ec24b SHA-1: f0df15a22aa25b781a9abac6299c159d4c3c2fa1 SHA-256: 17110872c5d4f8a27323b49c3db0da55b4582376c7f8f67a16e189e58507833b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages, aiming to deceive the user into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21d5d7135---46577089317.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3h3rlaot9um6oseqtvq1255j3e/jixutupabavomutodokilam.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13000805d---kabowex.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ba99ab218cb9f594d474d60596ae55ae/volenorenunoj.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/eo1dc6o3qdiv5qe8t3h0m8k3pi/furudizeviko.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071465583f51---17106452312.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501101626980386.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e926f18eecc---12073975885.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d5e1474b7c3---xuvefigejepovakuf.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df2df1b24---voxudesuredolatasube.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8375612f1---paxozipifopive.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/zawonowovovubo.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/10151119437.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c626040a---kapiromojigumonumalamori.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/74902506645.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/tl9jqfc68j8o984mnlsdbs71i4/77443891878.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c575bfd46c1---71654657870.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2189385ad45e8c8cc3d58f1384896375/63404797022.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f8cdf2651---motesuferaxejepu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7290883ab4---jekekusenenuje.pdf
    • https://bistakalikotenetwork.com/userfiles/file/penajedepa.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5v24nabe0hljf4opb69lc82tnq/49787438647.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0bd1231e---50858786606.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qd5e0jhb4ujqucjc47ukfb8q07/vazuzinufivenu.pdf
    • http://satbietthu.com/luutru/files/90602601851.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+virtual+organisation
    • 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_off000105c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 16792 bytes
font_01_sfnt_off00011dd4.bin
d6daae8fcf54773310f861ccce8ea326d07b39fb44625ba3563910e332c93047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 18408 bytes
font_02_sfnt_off00014e16.bin
07118fe68578300fdf490267b59f4ceb1b858d1c504e744e1bd7fcb4cffeb078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E16 10412 bytes

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