Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae2d65744c9349…

MALICIOUS

PDF

82.6 KB Created: 2021-08-16 14:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9457562cf9f34932b711b8250c04f80 SHA-1: 2d026c0658a5347b8dd0ca74f64890a6f467fe93 SHA-256: 37ae2d65744c9349a02d1f6a6b6ec129c42b184f26bca590c6617e5bced46b47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://salon-urody-bellis.pl/images/file/kapim.pdf In PDF document text
    • https://istanajp.com/contents//files/dowovefed.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/11288923677.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/64923527920.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845686027c2---59611703942.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/zurivebejuset.pdfIn PDF document text
    • http://sam-global.info/files/file/lavuroroj.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4b742c5c460bee625266d81200ee9dde/49268217804.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/72763870774.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8447fede---sokaterafan.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/pikujivuj.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/52895176209.pdfIn PDF document text
    • http://ecole.ru/text/images/file/47900898452.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7a7613596bc6f9d378cfe78d06fb1e71/37961882626.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/9385594977.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160995d1ac33ed---15174243023.pdfIn PDF document text
    • https://menu2uplus.com/images/file/97533065158.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210704154202.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/fajaxib.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/39979615667.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/fepatuwafugugunojusa.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/95918374615.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/pipadilijoxexejowital.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tangram+template+pdfPDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16816 bytes
SHA-256: 5f5cb8e894f02595919eada9fc4cdbd172bf0dae718be9f43698c72a056e2850
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10424 bytes
SHA-256: 60bedd42da9b625498cead632ff7d2e6015ae304a96151226a40823e45b5f19e
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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