Malicious PDF — malware analysis report

Static analysis result for SHA-256 67665da2fa4a06db…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 21:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7d099bca99fc5984ca289bbfab9d1dd SHA-1: 1a8a3827d65fed9fac48224cf4e97d2b021a9e27 SHA-256: 67665da2fa4a06dba255ce98d64d741bb660bd908d541d86fd36cdbb38a9d4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, but the heuristic firings and extensive URL list are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://chcial.ru/uplcv?utm_term=nubia+z30+pro+price+in+india PDF link annotation
    • http://vettercycles.ch/userfiles/files/vinigotefi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613022f91deaf---73746564095.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/33949221306.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70789700646.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/34883855478.pdfIn PDF document text
    • http://consade.com/userfiles/file/jilelinemizidodazurega.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87588979077.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/peximupoxamuwawepapete.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/41555397337.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/sixabumegijumigomuvowuja.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/migoxusopamufu.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109010432435658.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e8ed74a1---9945611835.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909092719240.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/84520587384.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/70472958622.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/88483766903.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/50292398976.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5516124be---16622640702.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/begom.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/kewijobuguxufisazasunor.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/97520383559.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/30712340223.pdfIn PDF document text
    • 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_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 10764 bytes
SHA-256: e9913386e71ecc3c285766200b4eac95b080449272f5f332245c19f0bf63b08f
font_01_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 21064 bytes
SHA-256: 0dc0fefcb72f716b25d7a3f2e8f748eb8bc3d035f8bca74db9c52555399559fa
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1