Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c15843ead0b9872…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 17:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 903b7d9f8346af577a3e8906cae883df SHA-1: 5d6682428bbe06645a0ab8c32730ce4ca269ee0f SHA-256: 7c15843ead0b98728001487c1ff4c69e111f0db7a966248fa9d14a5b8f49e0e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a likely attempt to lure users to malicious content or download further payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • 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 https://maintogelonline.info/contents//files/kovazegewi.pdf In PDF document text
    • https://tinnituskozpont.hu/files/63973248371.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814aa33a96d---robunesorokopinira.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210824223517.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210825041300.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8ff5e03a---sogizobaxesiterapodo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/bimefugogat.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8b6272c407b90dc5b01bf805578aae91/sagotij.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/2230812852.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/28184141034.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/97692222576.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/sotudirina.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/kotitudojit.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/nenogelukafuwajawinamabi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5ok8k9dc37fsj27amdhhghbdqo/39067508365.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jopavinixuju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ba4fb4bc9b8bde8e6be6e36ace8098c6/85496160210.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/xadozowep.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210721174239.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6ea3def2---85683606982.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bc5594a5---mejumadufekenipunode.pdfIn PDF document text
    • https://capecoralliving.com/media/file/30593646983.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/xuguxu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812153ad138---5035772834.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1df4d15d73c3bfa1310e5b9e66eee7e/3446797117.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zivojuzoduwixewosav.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hthap56q6lm08l9nrqkdl5aj66/bevakuxizuwubefexadifaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gases+sanguineos+pati%C3%B1o+pdf+descargarPDF 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_off0000bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF97 11096 bytes
SHA-256: baae8d83d854c1b774751f5e274d56f0eeb08c44eb4292809b6c7df52c6c3be7
font_01_sfnt_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 17540 bytes
SHA-256: 0d1270a0d2f87dea1086133ce17d316ced5b3037ebca759581d2f35a4ae046e9
font_02_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1