Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b662aae2dabdbdc…

MALICIOUS

PDF

75.1 KB Created: 2021-07-04 01:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de06ec4e211c68e226918601233d0ff1 SHA-1: c9c7c05892d979a308a7b810f9f8775bb26f310f SHA-256: 2b662aae2dabdbdc00c0ed506222e779ae7fde41dec376e515c4ff95d802dc07
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://say-international.eu/userfiles/file/kivesemokodomebokadipim.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/b22906dae6ca3ec15b6f8a9348064bc2/denovigefapiguded.pdf
    • http://botosani.ro/img/uploads/file/61865738690.pdf
    • https://angkoronetour.com/userfiles/file/zibulapeviloxone.pdf
    • https://kaptenhoki.info/contents//files/90097270851.pdf
    • http://ascensionchina.com/userfiles/file/91045947086.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c983860e---50021573378.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tfjjfc5jbjf2jtkn0hpeui64c3/korimewemotumuwume.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57426d3e7---bopajo.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8jj8mmm9hfd5b3mmnljf9i05l3/zejazed.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609039fc1beaf---29656905640.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/us0lpdsq6ns37ltqgntm2e3boe/porugebuxomimar.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/23892127388.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/33949de6be047e790b78aa6ec48ea3ba/bibugovopefiketivut.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3a61c09o0un18d7s8ocbh9qkk8/fipadisudumubomirurulebu.pdf
    • http://technoculture.cz/admin/upload/file/47032168768.pdf
    • https://fishboat.hr/files/tasigekubovibagakaxipogon.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a574bd1d---xumoladitavuposu.pdf
    • https://actorconseil.com/files/file/64000509021.pdf
    • http://bassbasement.org/userfiles/file/76577010257.pdf
    • http://humanitool.ru/userfiles/file/mutidikobaxiz.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0267e6147c78a205fea2327aa197e8b7/famigipide.pdf
    • https://mariellatriolo.it/public/file/jupokedesupes.pdf
    • https://sjalikave.hu/pictures/file/xulubu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tcp+ip+multicast
    • 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_off0000c33c.bin
4f26dcc5a1f5cef1a883dbde3a60ea588554294d3ca5a462d29e9c1c12d8ab2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 17264 bytes
font_01_sfnt_off0000f09d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
font_02_sfnt_off000108b4.bin
4710e705b027ef240a5adf61575ed7bfae769a1079975ca3b32f956875ef4a30
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 10144 bytes