Malicious PDF — malware analysis report

Static analysis result for SHA-256 e673fa5648fec98c…

MALICIOUS

PDF

96.8 KB Created: 2021-09-06 02:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22393db95fcbb8df5ca518a77dcdf40b SHA-1: 88e016315b26ae325d9305c60b6e889e86310ee2 SHA-256: e673fa5648fec98cd80423eccdf3364ae40c7b7fb6c9787544029470cf54cb67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a link farm strategy to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ba558f8040879fd7db1f20508d245f21/jevitujeposovozifomojalu.pdf In PDF document text
    • https://martabaktelor.com/contents//files/66128808467.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/votivaxipuzegudukibe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5c62290c2---87211459139.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/dopexosiwi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/62370457664.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/20570729002.pdfIn PDF document text
    • https://dcimx.com/files/dasokozatuxidejid.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/deveda.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jivuxodipufukuji.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/shsd02b2ngp91f5v003np0du4l/tajurajuvomubonumob.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h6ghdf9c90maeftfth6hmr6rkl/57280218564.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/5319073129.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/mowesaronumorejuvawubir.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/63525702272.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/nejozatabe.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/23cd09b0c39808d1b83664754468df10/fenuv.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/91145285626.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/22b9c875229e197437271016bc1bf3ff/41535595750.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/93156fa7bc212490bb456b8ca189313b/99406437141.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/ruvigefamigonabeniputi.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/sudexavega.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffff548db9e---64052900502.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/musizinarijarava.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/28033f2cd4538ddd2fb81fb0604df34f/misixapovuxatibadal.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/630c212e8badef6b5ff4ac7f9912a395/369860974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pointers+in+embedded+c+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_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 10716 bytes
SHA-256: bbf4b60e266433d4ecda3d2a1ecd50e03f9efe53fb59d3ef3b41ad05c7bbc97c
font_02_sfnt_off000143a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A9 19028 bytes
SHA-256: c655a728b07bf3cdbf4ac13618987aea787aecba6c624223f86482375e035cb3

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