Malicious PDF — malware analysis report

Static analysis result for SHA-256 c309df8117f43c84…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 12:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd5bff47c4f67d40bd1b8f7de46f6bdc SHA-1: fa23d4577f9557410790da91e8ee1390a3fb41fb SHA-256: c309df8117f43c84c4fd9f9a4ba86be0b6bdb2299b05e0abf9b2d5f359db13c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://flagrant-desir.com/userfiles/file/xiwej.pdf In PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/41993714825.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e56cfc35b7b41009b4bcd5a72a2363a8/mezitofetadobir.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/13953946113.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/xarofuk.pdfIn PDF document text
    • http://hkwwta.org/userfiles/42809063380.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8ff86b40f08d122ae2f1c3638568e276/20406069602.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de83f80ad54---dovipumezoze.pdfIn PDF document text
    • http://oklogistic.lv/upload/file/5008078927.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6327b8c579d2c3872fdb07500ad64479/47711127372.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/76388381954.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/48764153407.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeba71481c---72558671014.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/guluxixelevipusewu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/055d0b2b9999332c8a3054b164fd19f6/dezexojexuvovexevuli.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3e1d63fff148c930cd7ed4a89a621435/rezosimunukamirexexe.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c7ed3412fa7cfe2d18b10179695268b7/92260730633.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/siwarusenitulogatowi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16107ef526dfee---zemepejuzuvoximuwat.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/31910684917.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2d51565829157bb516ba441d5883643f/81594968429.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a1975c8fcbdf3ce58cdb93189eb81486/73723448528.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088c97227068---70403844325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=interpersonal+social+rhythm+therapy+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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 18108 bytes
SHA-256: caa822b8895c9b4b691f192693f45d2940e955a78359ac6939f15ac0970e69b9
font_01_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 10948 bytes
SHA-256: d33131800bdaf83998f6f09f45ca1a59ea0ee6d80f3c5c9579e46f619cd28cae
font_02_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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