Malicious PDF — malware analysis report

Static analysis result for SHA-256 d291014f50108709…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 05:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 982ad6263c3f829e5975d2a513aad155 SHA-1: 03f1bd15a410a185333036bc0cd631f086be77b2 SHA-256: d291014f50108709093039e41fd2d4169c2f560f07e8071fd06336c2a3f054a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/95833366588.pdf In PDF document text
    • http://chono.mn/uploads/userfiles/files/zofetagumavinulit.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010454453026.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/32906114561.pdfIn PDF document text
    • http://stefani.cz/fck/file/68916135492.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41316823804.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/90361417834.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/60758346223.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6tt869n6lgosckk8r43hf1lfkn/gusorokazevigamofov.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/34771234956.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/refokisugim.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5c4e0316---90163233069.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/reloputebonugejaweketuzeg.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b618bb60---17411919378.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4k0k0eqqhcjkp4q9e84roa2s8o/97098192768.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/7910211249.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/84677715238.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/99773242855.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/boboromefipogel.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/pisuxasobumabola.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/wumexog.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kotigakovek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=galaxy+tab+4+update+to+android+5PDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10924 bytes
SHA-256: c6d9960c7e236403dc79db0b0bd09b2219ce938e80a3378736c3c4ac2f3839ab
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 18848 bytes
SHA-256: eef5a567f7491f9e524715e175538610314d138786d323e0238dc8165e882064
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1