Malicious PDF — malware analysis report

Static analysis result for SHA-256 69263ef0f63c1876…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 12:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 370cc09cedb460fea0c31e2d4e902522 SHA-1: 6bc1ebdb6529a0d577f52807e0694435ffb9d44e SHA-256: 69263ef0f63c18768fce309eb276dd4d9785e824f79526e0dc70ae8d9e7ab3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains an exploit. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/89152455168.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160782ef5427e3---38968841594.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/kezimalareliwovaz.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/007904925c390971c4947e2afdc3e593/jivile.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/maxerexirutilusujizipozal.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/87995690515.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a690bbb0de---komopugefaxunofikexipeg.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607603ed69a13---38815065807.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/84707835121.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606f058117432---22678125582.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rf7ir3ttvpjf2ck8f75tokhl16/xozuzanotusasotu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4srq03cacmtg0gks57c4hsgkt3/zikutiboz.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/jivafawimexonejoludumafar.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/xujixuguzeboribesikamitux.pdfIn PDF document text
    • http://imaginove.eu/data/Files/56053084387.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083efcea7ead---57493409856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=entrepreneurial+finance+5th+edition+leach+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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 18744 bytes
SHA-256: 59c7c8114dd4adf86f9478a71427e30e2c6a163666c36c096850a06e89bd2b59
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 10768 bytes
SHA-256: ab9a95f2807ffb35087e7511011b9bbccfc28557a18fc751c239d2b78cc0d795