Malicious PDF — malware analysis report

Static analysis result for SHA-256 933d12825524adcb…

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 23:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c39e59e9ea8891a2f35ec5b9d1665e6e SHA-1: f670eb93f2aec79ef1a42520c9f7accd22823b3d SHA-256: 933d12825524adcb8d300f1620349ecc0edb1b9df0961bae337ae2579f9f8abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute further malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's part of a larger phishing campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e4bd8337ba9c01ea5ba8105d7655d73b/sokexupexugirojuxavu.pdf In PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210717_4DF7C34B9B8F9A06.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/betorovubekepedagut.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9187d31aed4e51ea66ad255126a1df1d/fibivokovekiniradolax.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160814c9e05a0b---29256623775.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/iuoradfb9ei0odu3gjn3kv0u5f/rifavorowibasuzapas.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727feea5e8a---fodogesi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/xugonatalamokekaxe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/32b204c18ddc13e1d85d6181953ee0f1/lililuzikis.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/138a7c0d0b2d0f991f93472cce7a1ff7/fifiworilusavumesepo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0da5e259d---30753247324.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sepapitupogonuwa.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/37527352607.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626876700.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086bff99ace0---12953807533.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/983936f806ce48a466a29b99dd89281a/16929883929.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160974403cf825---91610650947.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/39190862756.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/fozojepex.pdfIn PDF document text
    • http://ezibra.pl/upload//file/vebomugazasanobizozagaror.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/52785005768.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/wimewejibavoxufusugirase.pdfIn PDF document text
    • https://aashianarealty.com/file/16145129441.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ca5eef1aa---niwufevuduxiguguzapos.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/47538038313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=psychology+applied+to+modern+life+11th+edition+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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16584 bytes
SHA-256: 5dc4128058922fb3087ca60b18972648fde23d16efdfbc14ac3dc2e57c632f2c
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 11232 bytes
SHA-256: 42a940b90092048fcc796d23dc3d5c9558c656beb71e62154d5ab919f7c2fa6b
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1