Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb3041d1f844cfa…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 13:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c19fdff5de6f67b06d7894db9a951d6 SHA-1: db37066c7ade2655630e81e4168d8e2f431df6d9 SHA-256: 2cb3041d1f844cfad897685253e8f2b008a05942fea19ffb9c1d6d68ceabb6f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of external URI heuristics and link farm indicators suggests the document is designed to redirect users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=how+to+download+free+movies+for+android+tablet PDF link annotation
    • http://studioguidobarbieri.it/userfiles/files/36733438262.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bowobufexij.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/suvomifoxiwewokisir.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zaludatipalozamesojiv.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f99d406f8234b4077a9047b01f62b99f/30647311116.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/dojodobumefujexesoruf.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/38151553185.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613134672f156---27324214684.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/mizenekekeferulam.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/46551000426.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/33249757431.pdfIn PDF document text
    • http://prmakeup.com/Image/files/winufevuza.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/90120127174.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/27968372839.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/95636626872.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jesokuwivu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02781b75b---43575451490.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/43618720627.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/10540829377.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/64sprde35r8vvnvtm1eodii451/ravasetulizaxifefiwona.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/53671689126.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/89209939061.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/kurozigaremifirodizuxigog.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/14708059082.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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 10800 bytes
SHA-256: 449503e36a733d0088ada1639c61e58cd6118d024cb3b55b69e71fa1ed2a398c
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 14148 bytes
SHA-256: fe671ec5e0ea82c45b61909c56bf3d209851533f375638f2beaff91a258a644c
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1