Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac07e4b69d6ac8a…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 09:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e548f51bda39cb05c5bc53f638b21cb1 SHA-1: 1ed0cba68432383e6f77045befb5594fd7ef2a97 SHA-256: 9ac07e4b69d6ac8a5acebb339eecf394db6fd952b5c95476d33d91baa19a5da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The primary goal seems to be directing users to download applications or other content from these potentially malicious sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dailyxedayhang.com/userfiles/files/62476936008.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ff4cfa1e6949957542586bd1a77b453b/punoxit.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jggsj31lvmllo8v4pjqlte6erc/vudojatabipigepizomej.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3fb4560c---volajijumabijid.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/15573336301.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-26/20210626121509399120.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/48433274a6ef4c114bfa89d6fcee2898/dodinawijurubusukosuva.pdfIn PDF document text
    • http://ipublicity.cz/data/file/63542863044.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d08d3c4966f2c02f0cb27897a353aee0/gukuvunujarogak.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/1107639258.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fdhid0vtqrqpjdal1c8poadll6/magijibonoparipox.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/nisexo.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdfe2ee53d9b7784cbda1d4e07a646d2/xijapajefu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161182aa7144cc---zozalusuge.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/jumamusazegin.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607911fe96fdc---6063502876.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a9fb7e9b---pojelotufarowa.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bedbbee32---ruvakodubolinixovowifeler.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/75686498936.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24170afd0f---95447248019.pdfIn PDF document text
    • http://candientuvibra.com/images/file/57951603295.pdfIn PDF document text
    • http://sinoorchids.com/image/file/86154733018.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/77286018140.pdfIn PDF document text
    • http://www.bash.cl/media/file/80366016591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=thoptv+app+download+for+android+mobilePDF 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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16580 bytes
SHA-256: 52499195138d60b8d3eeb0502f064bf8fa0f62f8e2b016731092c1835e42274e
font_01_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 10848 bytes
SHA-256: 4361130b0380d3c677d50b5d7e1ba291bcc62e94dc47a4850a0b1019319a8a2b