Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f9ae1e0bfa9a06…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 16:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93833156514e4e66eebec8539eb68e62 SHA-1: 69fd346534612db9362a47e477893ee7d21ccf78 SHA-256: 94f9ae1e0bfa9a06de05d0d5d43152fb59aa2131a78d5d848a21dbd78718b17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of malicious redirection or content hosting. No scripts were extracted, but the PDF structure itself is designed to lead users to external resources.

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://minerva-collection.net/files/files/ranodirizipefuzusizulip.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ec0dc68d---55695326543.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/zisiluxedetonez.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5983676d1---ziselinuposerawadu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tadepipi.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/73814721855.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/65274817957.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/pixurawanigumozelidi.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/zofekowa.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/11566106990.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/99129213665.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0fc03d10---96673795697.pdfIn PDF document text
    • https://noclegsosnowiec.pl/eurostyl/photos/file/22629216666.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/85018999959.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/76640676993.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/butesonuzinokoza.pdfIn PDF document text
    • http://telangana99.com/userfiles/file/73487703772.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/34576042498.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a4737f988b5a7a457d5c7a95b59aa3ae/lekinokeguwed.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/raduk.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d804842cb---47293518321.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zafulimejarirabak.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/36502227196.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/vasagikaxajuxazizewed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=any+open+hair+salons+near+mePDF 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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 10512 bytes
SHA-256: 6c614e03ca8cb78b47b54d72cde9270e05995798be6c74f921b1e82c1c53cb5a
font_02_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 15100 bytes
SHA-256: 64d6ef64f59fab6a7e2d4582df36dba9169fa597e4479a248ea9daf769dddd3d