Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8880ec69d76ab47…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 23:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b8195e4ee6b1f48b6209e09b4611dba SHA-1: 5db9f8c857c07acebe4085ab3546bd8162330995 SHA-256: e8880ec69d76ab4709b66d8ec05df565759bf32ba1bac023d89312c47aec58df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://fotofolliasanlazzaro.it/userfiles/files/gonogejevuweloge.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/4490190602.pdfIn PDF document text
    • http://belloverde.net/emailer/file/45789669035.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ni9700r0mgqva22o1ue45vk1j6/dupitumobir.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_055905.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420222e9431---89355177689.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/bufuduvubovut.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/52214375459.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/kogexakuliva.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8b900400---gogukejupifavutu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/01sgne4cojfmkt5vba7e2s8lo6/84140358480.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/54268362307.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/16054847024.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/notivakomuzunibejof.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/garafasedokoter.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/zutuwanali.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/41286893633.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/nutibavexis.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/rowiwenakajozegemazi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/wikelalovafinejarumuteke.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ctoke3qd7qabhs3jdo7tc87t74/wanarafirim.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/27534228966.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/levojapopeji.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/32435843636.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15300601700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mortal+kombat+x+iso+ppssppPDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 15952 bytes
SHA-256: 1b38b0709dff348200fb857cd3c03e3e8076247bbf186e30a050466f960bf64d
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10504 bytes
SHA-256: e3fabbe7398d886d986f7165733b420b662ea34374b2d27bdabfd36a1105fe83
font_02_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1