Malicious PDF — malware analysis report

Static analysis result for SHA-256 4399cc7b76e98a31…

MALICIOUS

PDF

80.2 KB Created: 2021-08-17 13:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ae3c17f78ee9fefa0f1b7a2fec24e9 SHA-1: cbc7f77fa45648b6e76e6ba263fca29f65fd2dd0 SHA-256: 4399cc7b76e98a31988a3423b8c3d35f0303b631e13c586c6715f598f7fd9ab4
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. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=catalogo+price+shoes+urbano+virtual
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160999dc124197---64107883915.pdf
    • http://mega-treid.com/userfiles/files/divetulajusujosodavev.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4a0b4fd977e20c0863ac3ebecdd5b2f0/59634872253.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e03f0b27e01---sexizekovot.pdf
    • http://laclonghotel.vn/upload/files/jopudetilivomik.pdf
    • http://eviljoy.com/UserFiles/File/rulonalabupawufilawaj.pdf
    • http://www.motionmantra.com/userfiles/files/7491090985.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/41b2df586036020636935db9b0bcbf35/57107309764.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dcc8dde3ed36e3f32a3dd2967ef46d3f/70707144806.pdf
    • http://canadanur.com/resimler/files/nozemamabom.pdf
    • http://intertexmedical.com/userfiles/files/masulalavezupopifura.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba106fcbe---51549891783.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ec6mtci7gct5c86t2fnnlh46k5/36589290884.pdf
    • http://rasmesafar.net/basefile/basefiles/67853584116.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070964de1950---21081537281.pdf
    • http://www.hydro-tg.pro/upload/file/92692477687.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78f53b8da---perikoju.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079008029172---677855640.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdf
    • http://turinhotelcompany.com/userfiles/files/22245632691.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5108410be---jixogik.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204d046734---30008001529.pdf
    • http://hyundaidongdo3s.com/images/files/78631348614.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pivandbijdcn060s4q6bnj33pl/pitufozapojugejibe.pdf
    • https://arhometutor.com/userfiles/file/17796769150.pdf
    • http://jyjwqj.com/uploadfile/file///2021070718503974.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d361.bin
cc365ab41059e556e64791869a14dd250cf68a6f1c49a63b92df5327aaebe0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 10988 bytes
font_01_sfnt_off0000ecbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16792 bytes
font_02_sfnt_off000104cf.bin
62a643f30c46fadf4267ad16eab3eea2a1c0042de17e6a06c287438e30d64f89
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17328 bytes