Malicious PDF — malware analysis report

Static analysis result for SHA-256 859196b1ea54ae07…

MALICIOUS

PDF

73.3 KB Created: 2021-06-30 23:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d52f39ae220549acfa0a1ddbc2aef9f SHA-1: cc66506c375e9e36e60eb1d67b3e8e9ffc458b1f SHA-256: 859196b1ea54ae07aa52bdfb6bc955137fa77eb09df2c804817d1122a0df04f3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, many of which are configured to host user-uploaded files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of these links suggests the document's primary purpose is to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=what+does+atl+mean
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c0281607---jojefadisob.pdf
    • https://samngaimarble.com/html_upload/file/31265140156.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17725aa78---mibine.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cf7c8321---46674243241.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a31329747---98653092506.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/rumototifototu.pdf
    • https://cjsc.se/ckfinder/userfiles/files/sisepiwekel.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/lakelul.pdf
    • http://i-daa-wl.de/userfiles/94263670146.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rd1dvcuijh2vt6epu3ecbeou63/99493739216.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3bf14425a785408aafb4522f66288057/39563876555.pdf
    • http://bigcool.net/webroot/img/files/18262321690.pdf
    • https://floridainvestment.cz/files/file/tomirobebotibigawifewavij.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d483c83d6a6680938f2a8f80ddfecf60/33687632992.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/685fdb7b6e8d7a1ba66eb37e623afa0a/sopob.pdf
    • http://euro-ex.com/wuvatuzonewuzukiwirati.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a86d3c85197a86c1fa067abe220bf2e2/temizajokiboduxax.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40c4057260---79462866356.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/92025134149.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae571399c---kariwatuzelowusaweba.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/25273afc51fd174708b27ae5b5486763/97281310994.pdf
    • http://begemot-rus.com/uploadfiles/file/2021060617451873499.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/t3ttlb33mtcn7i8d3p2b9a0qcm/jebosareketomanewud.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h49170p8vs7ds7vth7otof0uh5/96020796404.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607554d636479---1904467296.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2cec9e1af1a5d93d671b0bc69f8da220/86913193837.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39c5b0917---83540781374.pdf
    • 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_off0000bfaa.bin
85ed72827a8439c783f9adb320313ffefcb642205fc8bf47ee5dd74e9b6d98d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 15860 bytes
font_01_sfnt_off0000e8ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 16792 bytes
font_02_sfnt_off00010101.bin
3918e4b19a84eabc54aaa22297c2aa3c6873a337576fe697f7581e0d32d18976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10312 bytes

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