Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e35918f3066023…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 09:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f3183b7096e9343d7f7190c19a3b594 SHA-1: e53245e1df8dd8dafdb0e0fd437393351f22dbb7 SHA-256: 77e35918f30660235f6d6d448301d3b2f5bf921501f6a05930ffda2113d405d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fszhenjia.com/upfolder/e/files/20210803014610.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bexetipibiladateni.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/86820368891.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6480ac83---93155462973.pdfIn PDF document text
    • https://guijek.com/userfiles/file/jeperilekameme.pdfIn PDF document text
    • http://cjatkinson.com/userimages/ratuwozulimazitenakavi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082243815817---69625514455.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076111b803ae---gaxakedikadivuj.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/68657229577.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/amhtr071oo9t4v6t15o2iu5j01/baxukabutejev.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/33769093639.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nipemovuxidaxukifasigo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7c641c13---74033784919.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fba3825c04---vawigupit.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b820c95b68---67267958918.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/54387216639.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/73651988204.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kbf9a7pgrr0c770ctkfer7v5c7/86601131961.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e32e7dd6---33977140508.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b86889c20---punimemenefebuboritef.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996521d304---10060382735.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6e794a49---10046567266.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210621143748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lincoln+high+school+track+and+fieldPDF 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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 18448 bytes
SHA-256: b79c14e5c31d3b9127d3e293a190c257d758be889effb8368ed6fb868e597f40
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10804 bytes
SHA-256: b9464dd50c43418bba2eb066f4f70acc96fc59b89527192067b0f6604237a31e
font_02_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.