Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6ade282b7daea7…

MALICIOUS

PDF

81.9 KB Created: 2021-08-16 08:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c09b74121fa1e3d82cf9a220f7c55be SHA-1: 515ca5d0aecfb9ec85a46232f3d13c2cc86a0799 SHA-256: ba6ade282b7daea74723972d9f2ee5102558d38cef647238fd0607315fe6bdb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=how+long+can+you+wait+to+change+transmission+fluid PDF link annotation
    • http://kaushalacademy.org/ckfinder/userfiles/files/kikagokorokowabigejugiw.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/45932283180.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/49618670584.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/72923158831.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/45799169695.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7e1e4517bde718ebe1d5c04340df87fc/xupivonokujamakon.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/10565290876.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/51377026057.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b5aab227---zakoxupuvinit.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591b80dcd2---48623197012.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/11q7t93of3j3luhm4nuiouhk7h/39353041512.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b501e836276095111da9933308f584e6/zaberigul.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/famuziduge.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b591e0cad9f---53143209471.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/melipometebipimejuser.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///potujebagetokevuroguja.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/isci914tg9eet3ff5be1qht4s4/39425692352.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/kamisexojuj.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/53052270683.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/20341089257.pdfIn PDF document text
    • https://protrialse.eu/files/files/18257848371.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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 16088 bytes
SHA-256: 0ebf81b3b34e4bd7afddc792c6b75a874de17bc87f310eded1bdf15b23e85531
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 11212 bytes
SHA-256: 9054da194ce876b8182d61f55f3b02f90c628c32050f2d3e9a7e54631883c7fd
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1