Malicious PDF — malware analysis report

Static analysis result for SHA-256 540d8b2133963457…

MALICIOUS

PDF

100.7 KB Created: 2021-07-13 05:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38a97548d69aaeea47d7d2496128b896 SHA-1: c6f4e4b0d7b7ff430a62193325002bbe9ec4b649 SHA-256: 540d8b213396345706798d477d514506e4cf4ce809cf0849bf73f7e3eaf2e2b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links are structured as a link farm, likely intended to trick users into downloading malicious files, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The embedded JavaScript is likely responsible for redirecting users or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aite-materials.com/upfiles/file/kamufo.pdf In PDF document text
    • https://vieclambanhang247.com/upload/files/41182172408.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/doxumagawebisanukoxoju.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/tejexarugu.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/fiwewokawowidogik.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n5ujbpn5d97qq59gebls55gih3/55205112737.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/buxosuxatoxuvojeji.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d568a9004d---dakavulo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a518953a6cb39e737879f08ae09fe56d/35585615308.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c1e8fef32a2cd8695dd7909566a820f2/2604937395.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a570cdb0---xozusopafojifudo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/46c79863e6877e96a070d14c38e96ded/4088329491.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5de09c303---wofajotamesikawara.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/60246903257.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/dutorimono.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/52061f5c5ec31cee3d633bd7de4d5296/nefeniwelimujukomeniro.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/gubewomunege.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab234e3c4a9---novowetimowedizemo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/410907c1ab30e08b1a2d20f2d58af0e5/basefovexasabukodikew.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd89d6699e---joxoruronimemixe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370ea85324---xivifiwugidomazitubuduxu.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vapenef.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/82c29cbfaf2e9410f84e40e4c7cc1aea/rotaloradopemejofulaji.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4c8f2250c9---83210188185.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/fomijokusarukopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ppsspp+games+download+for+android+gta+5PDF 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_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 11060 bytes
SHA-256: 1090a53dd5e5ab9165fa002895b2ce5de2f38f05130f72ba3f6c320fc1a3e919
font_02_sfnt_off000153ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EA 18044 bytes
SHA-256: 417ed7a690cc8eda0d0752261f50589b286411b4c50df936a522b1e70516fece

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