Malicious PDF — malware analysis report

Static analysis result for SHA-256 441ae320aa024751…

MALICIOUS

PDF

119.0 KB Created: 2021-07-23 12:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 225921d2640c4b4713d640cab1819cf7 SHA-1: 48ff5588897a626366613e28d6130fe017d3b474 SHA-256: 441ae320aa024751af4148af77f15b1924cd0a6722516375a3a921da9fb7c365
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. The embedded URLs likely lead to phishing sites or further malware downloads, consistent with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/29d7ee18659c36ce891306b8e0ca385d/4243566380.pdf
    • http://diversecityuk.com/userfiles/file/suvejiwawozimijebenof.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49900f1c50---86287706561.pdf
    • https://preprodpcb.com/userfiles/files/41693893070.pdf
    • https://nattasampun.com/upload/files/54800362412.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/rozizigasabinut.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg2ku99fhlmgd9a1rpo6mfi16n/83875830081.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6645848b2---80885742303.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e12b56f43---winarina.pdf
    • http://wittlich-luexem.de/userfiles/file/55987689423.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6ba6ee6b---89901857200.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cc05c4ddc247136696501d4bc3039557/xikibezoronipadisarus.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ee1a2cebbd031f2e0abd367331ac31b9/61522504045.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b014cfc9---refisalufidajozuvanekad.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/hp3bmufjq61t9rsdi6etc4d7bb/jetesogabipegus.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdcac6506---pixaki.pdf
    • http://stroi-sistema.ru/img/jotiziwobozixedi.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/soxesewezufobevu.pdf
    • http://fnb-concepts.com/images/uploads/files/rorafav.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b22c58c---wavudeperewawi.pdf
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078d979476aa---26198236456.pdf
    • https://flyfinz.com/userfiles/files/nidadusarutafixulin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bioethics+and+biotechnology
    • 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_off00016fe4.bin
fb09f725c59e5bf32c34b6733072939072ec03648f15053d7549953ac1d1b881
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE4 10856 bytes
font_01_sfnt_off000188c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x188C0 16792 bytes
font_02_sfnt_off0001a0d2.bin
5320223dabe29b100d09a3932edbb7b4881be02dc5f9f2052fba71296f255e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D2 16972 bytes