Malicious PDF — malware analysis report

Static analysis result for SHA-256 34559d7a5d9bc0bc…

MALICIOUS

PDF

73.4 KB Created: 2021-10-04 15:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2761cff3ad79c8a0b4eb0bbfe8880b42 SHA-1: 74ce632b64738cd9f08b0abb4e20f84f228e73e1 SHA-256: 34559d7a5d9bc0bc40da48033be56a8e9c48dbb0343086a5b6715db85f6dfc8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or distributing malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3688

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=contribution+of+ict+in+education PDF link annotation
    • http://www.abitacolointerni.it/newsletter/file/9759132614.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/10796895491.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/66753668666.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r6m0966au23rkald7g65efev12/barekes.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/labexidimevopimuxarejuj.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf2b66851---surobutobituniriw.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/turinunonutokixox.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/15605246419.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161434da6daee8---dukizitusasunukulosusit.pdfIn PDF document text
    • http://theshop24.com/userfiles/file/37803034492.pdfIn PDF document text
    • http://sogelec-eng.com/files/ckfinder/files/zabezazobimikiv.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/42586245320.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/55048780259.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/sasikavag.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac1e0f2e0---24366672564.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/16069892556.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/86608689122.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/jawofizegadimatezerorir.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/fobilo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ezomaje.pdfIn PDF document text
    • https://ever-progress.com/upload/files/20735523992.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/gawevivilomovalimunilow.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/81647535145.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/surobisalonudekevome.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/4250459970.pdfIn 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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 17232 bytes
SHA-256: 1871bea0e84a6794639327354f4cbeb293801329d2007d46950ac7980db59f35
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10524 bytes
SHA-256: c79d13f5725839e486244939bd5e3752aee7c0e27133204cc4066aacceaaedc3