Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ec4acff3c3925b…

MALICIOUS

PDF

87.6 KB Created: 2021-06-25 18:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b556b9667abe149b428f69c2c0ddb87 SHA-1: ca2452c8386536877e8069aca0438f6bf46d76c9 SHA-256: 51ec4acff3c3925bc84fa4afa1f429f4d16b57834c74a5f8b4676a7a1870835c
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 WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=guardians+of+the+galaxy+1+full+movie+download+in+tamil PDF link annotation
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d129feaaf3---60879337189.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/55855999375.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xedogotolunal.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fekukol.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tpcoqaurr1auv25c5fi48ggkv4/nejopiwafet.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0632ded1ceac52943f9aba0cf9887157/78755700406.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ov01v8b3435tkduiv6qa224tqf/vevarukogavigizexega.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f2bea6c82a43ed42af575a1383807e6/30874254323.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h21lnto5asf026vrtrf2mjvc3m/tatumurinumigide.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/39128958686.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba4969163---xukugeposotanubotej.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ff32ef8532c65e978a0a91f4d1a5fb49/gebazukejifumuwutizumuv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a35f55e9d---karoronomudilofuje.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/fuxogabej.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/736240297c80ea3978cddae6b633e184/jetesi.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/konowozuxotakevare.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a388eaf1585---wimad.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed34d21e06---78517453374.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7e4acbd4f51e16c7d29dcbba250623ab/33713402854.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b36fcd520---kodizazerarari.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qn3iaet0udgo1q96kbruj8eee3/17183016317.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af6b8bfc17e4e2be7a2fbea28bf31f49/gixodopuvi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/217d0e140f19a71f9f4c1068b91d75e1/50157072689.pdfIn PDF document text
    • http://nprofit.hk/userfiles/72146953857.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/69e617594ab554b063c9f8bf25a48042/gubewemagoluxox.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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 17836 bytes
SHA-256: 206bc947a1a227f1b3df2df5714a6322c075ca2fdc111857fe2aafccbec099f1
font_02_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 11360 bytes
SHA-256: 2078e5bc78b2381af676bc28a95934170fd8425f911ef2448a0c8403c0e3fea0

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