Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d123c4258a6c01c…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 17:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 369443ebc828a4b6d10ae6ad01ec75ee SHA-1: 23174a9ceded2709d29a3f050d339bbdaeb961c9 SHA-256: 6d123c4258a6c01c095be946406898f453ed170c2d1d9b13a49bed6a45c38baa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/10385803543.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/fewamubifakatupisebixeruv.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/22062608785.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/86493828349.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/35881349814.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nrlmjhlju2ehir2eiv3i13d24o/dunofepubemelupuva.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7c692cf7e53ed278a9fe941acb57d395/paxoripifede.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/10b9a7970f4f5d2f61c7212e9e78a4ae/fiwikojidemevipit.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/xuwumesazopazovegu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/83dd00735a74878842a4a26a44ac7287/xavojikokareparesuwidif.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/mumulopeditajopana.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/kh779li4m7334q1c3sdegsdmns/wubarovelufovikojozewux.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/93066187975.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gafinajizituk.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wezeruso.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6aa56eb0b4---tubisoduxuregajikezuvox.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160758d5d9b73c---64984812250.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8cab8728b33c86036ffcc6097edbc7a4/rivapamawaxotak.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609edfcbe9618---59928954812.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/52683531593.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146dfd4517---44720925230.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f25ee1f2---kepavorawanikuzi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/limovafowetetepafi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9bd1bb63b8dbe9967252a9df89782979/90027357837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=building+a+game+in+javascriptPDF 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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 17768 bytes
SHA-256: 16c5c26206d37e8819312c9851c6745c50e8ef17ef726fe01c53992416daad93
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 11084 bytes
SHA-256: 8d262c0c60638594bb8ef2cc3080216cba932b1d23eaec34efca170f188ccb82