Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e2442d314e11eb…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 16:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3b6d7b34ba58b4e0e69381893033981 SHA-1: 91716b3d254dede28e2864e55f22aabf0d9a1dae SHA-256: a3e2442d314e11eb4436c4d72de5cc5c96e4a60a870e843875c735fafbb91bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on potentially compromised infrastructure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0ce652bbd4725848685a06593a882b24/pimuvomevasagob.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf4c31594---92114651505.pdf
    • http://studiodrago.eu/userfiles/files/60107344767.pdf
    • https://sce.tw/uploads/files/60d2331f66d49.pdf
    • http://kochamsushi.pl/UserFiles/file/87543599499.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/631144343b72570ade3d9b68d5cc5c52/rupetafirufewuganonunog.pdf
    • http://xetaihyundai.net/upload/files/89460903754.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ltuaer2ei8bl0sbe6lha7f582/60572103275.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/205jkkhb64s8pvtfr8g8ojo0n0/lavisenibesulu.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085360fb7a75---zozuvadedabamuruko.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c977989b1829dd9b78255914e36877c6/68273094254.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36ecd9c15---gunoxetagug.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b971e22b94c---fegeni.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/28561887373.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5cab88d15fa466ec3891e6fe3468771/wokawo.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d897c1c5---8357249238.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ebb7a3235---17981720935.pdf
    • http://a-kamen.com/userfiles/file/virubetuxijod.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/bukilumedozaweruve.pdf
    • http://dansecyr.ca/pdf/file/mukipegabozilip.pdf
    • http://charivne.info/images/file/62249484720.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d8c0fb64f8ff057dd0bd052cda042b9c/zinoxukexazofuruw.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1ce3afc63419a33a3bc0b86daf1ee073/91782740701.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/02hupa0jvb1dun5cib0k0748o7/25565788680.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=light+pink+blood+at+end+of+period
    • 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_off0000eacd.bin
44fdeea2e412fe795193ab35a6520e967a05ed1cabbeabcc8a672deed6a78bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 10800 bytes
font_01_sfnt_off0001031e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
font_02_sfnt_off00011b30.bin
e06980a8e18e63cde6017a5da7c8eb07bd0559aacbc1853ed2b4de4b4f60c335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 17060 bytes

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