Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b084887827e1c8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 20:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7bcfb0c75f784481e8fcf1e106760fd SHA-1: 926d23e735265d3084b0bb38ae9c96fcac4088c0 SHA-256: 37b084887827e1c8a5e456058734a5c484869c6a6b49290907cbf221bd65943e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points to a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=download+double+dragon+original+game+apk PDF link annotation
    • http://ottuk-e.org/userData/board/file/39033107312.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7425edc06---zogugopogeg.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1843610829.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/ritebon.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/kalabivonisevolepu.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/28998562409.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/18946763779.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/57596204885.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/funiwuvakum.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/15165951940.pdfIn PDF document text
    • https://samudra99.com/contents/files/84360431896.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091301180670554.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/gofakorupijibumebasuzu.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/72304519388.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/86706471696.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tupoporalepig.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb333a1f84---51371675126.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613094488a956---47268820795.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/mibozabakiwegudomepati.pdfIn PDF document text
    • http://nanopena.cz/upload/file/33968294474.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/96686148009.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kagijapereduraj.pdfIn PDF document text
    • http://dgjst.com/upfile/file/63584586351.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1062f136aae05f7bc32de8325add33b7/tudibunijifafa.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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 10888 bytes
SHA-256: d6854cd56c585ea8a98aaf393a9eff402235231083de3c4d7c27eba57ce29031
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 18796 bytes
SHA-256: bfc34f6fd1097e701849d022179dc6b11a6acf1eb380f31594de55a48cc91cc1
font_02_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1