Malicious PDF — malware analysis report

Static analysis result for SHA-256 db397b233936611f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 23:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64ca82ae8c850e93adf9c719f6645ba6 SHA-1: adf9905b169494c396111f4583fe4a80c1f2d144 SHA-256: db397b233936611f2c2bd676f0a2bd9e4c8725875c86f2fa0e86c9a8ee9449f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

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 https://cesiedizioni.com/userfiles/file/82196940513.pdf In PDF document text
    • http://estatepie.com/files/userfiles/file/vakubidovabaxetudu.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_2140ABA655E34DBC.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gidokisazikeje.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/lumenofezebofabidimukeju.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210906145809.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/7054839876.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/kutidugojiwevefe.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/samagikuvo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/04d569ae5beb54f788cddfb4b12f0eec/fokugemigalegojuvewikag.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109040308333336.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/koveperevivuzelazagava.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/3115352500.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/59720002066.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323194e71a9---39318141133.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210904234610.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/58207261013.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/risibakadakiboderedejited.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/68680038863.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/powesoxosozozugetoxinapuv.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/94119619079.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/8242196165.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/kigeluzazodavewugivov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=omegle+video+chat+ipadPDF 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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10680 bytes
SHA-256: cdf2c6421b556d269c752627b90684bde92b572d207bcb38e3d18e9a6af5f8f8
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 18592 bytes
SHA-256: e66f42dae1a45db6ce51d59925ebd31abaaf03d82d5e0baca24145cdb0e24bd8
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1