Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e17ed77457a713…

MALICIOUS

PDF

75.9 KB Created: 2021-09-27 18:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba8732a2f0f9c18d10bb86259087bb19 SHA-1: 0759d3e1122f0df5336a6b877be13295ca10606e SHA-256: 09e17ed77457a713c5929752558f3f5db829eb78264afd894c1dbf2400cbfcf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS uploads. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kiuanai.com/userfiles/file/dipanenijimopewatabuxef.pdf In PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/rifowovomikunoj.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/boripurivuxepuwedokafupux.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/52662755899.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/76755751995.pdfIn PDF document text
    • https://dintek.eu/uploads/file/32135026662.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/sakalolisofativo.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/goruwapekeboxoxafe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b367313560---niwezutarewa.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/93891593151.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/70984975928.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/bobelumav.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/fuwufazizedegabaladavu.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/26690202936.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf4mrim4ds195l5ruq3iam19hk/pasanajapubozosejepi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8cbaeb786dd2c74098ddeb6255c62a51/gowerelewaxe.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/44576772020.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17485293516134ebd0dcef3.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/69c51825392fa99c96f187d8d6060393/pijitedofigekuwiz.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613993261bd63---lepuw.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381edaebe46---kuvol.pdfIn PDF document text
    • http://e-menu.hu/editor_up/93994520930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+trap+adventure+2+for+androidPDF 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_off0000bc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6F 10696 bytes
SHA-256: 3de586be885a1b593f5f04748d480b1efc1f174056b9bad1f2f1bf80f4b83616
font_01_sfnt_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 20112 bytes
SHA-256: fedc863241e1a742ce51a59917a83d5721432149ab4b885baac5146747ae9b60
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1