Malicious PDF — malware analysis report

Static analysis result for SHA-256 a399da300cd72dbb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 17:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27a56bbcf98f717fb534198c7af812be SHA-1: 8bd9db2b92bec76668b8b7439a086a9713b5fa8c SHA-256: a399da300cd72dbbe6c52cb69f95cd8e76cf6e03bb959aef5d08d2625df5dc9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070258854a12---67678270316.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2j9hl68q2s2a0li22ee4ldojj0/18738083265.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/98872295129.pdfIn PDF document text
    • https://laps.pl/userfiles/file/luwelise.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531015504.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xebofokuxizifokipag.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949c953ed5---tobesodi.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210829215948.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607a37a37635a---85970667804.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dba7b481e60d770416565addc3480d2e/29254930468.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/otvqjcr568492259dqplk5tk00/zedibozikanimep.pdfIn PDF document text
    • http://ledins.lv/cms/file/dovazefejepuw.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/senam.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6c4bd7cfad32063a29a6fd36859568f1/89573198575.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/ruxebememutafawomo.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/peridirazadimina.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/zasefimutulukiwugumoxa.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/20375040008.pdfIn PDF document text
    • https://la-klamm.org/Files/files/77456130548.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/65024649485.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/70297854361.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/romejefiwedegogetaxomelol.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2d1d1f1d96a37fab297ec340af7edeec/24463799571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=in-depth+interviews+in+qualitative+research+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_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 17640 bytes
SHA-256: 7367a3b6cde097cfed32516015991cda9e85de04913c68ba11d49c45be8e855f
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 10980 bytes
SHA-256: 7ec0cd21c7881f9da5982c20ee4b86484c94944df6dad5664de344ffdee25a1c

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