Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0fda009252c701…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 19:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e316ef57293d2183f86e1e019becd7ac SHA-1: 95cc9ab71e7012068625e525350bef1bbbb85369 SHA-256: fc0fda009252c7015ea38d43dcdea1164476dc804cee524ce0639f045700bdc4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and a link farm heuristic indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tylbm.com/Upload/ckeditor/files/godamimojibisomumu.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/67969826026.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/rufinolurinosukunoxejaxar.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/figebumovomu.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/ziwuvigawas.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lagavopezedotaret.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/zanejezupide.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7dc1858d99eea32253b0f657aba052cb/golopifoxira.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/dobofujijanufok.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/94747018495.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160882136bfe65---junirar.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lt2741lffpkhfu56afdvfp59b7/kipukod.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/89576651271.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6chk1f0s1jq311a8h24j2frdjt/nekefabemewafavorapupetaw.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikesaloba.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/momugoxeporevemogagul.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/mugorologowemajulepiwo.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210827_195642.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d35a680980c21b18ca08434bd5547733/woxiguzojopuvukapobobu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/44262325826.pdfIn PDF document text
    • http://sjhtractor.com/d/files/60581348979.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c660ea36a22---sakotogekit.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vv8mmc6r02pt30lvdaafgk3pdr/vufobanudewuvelalebivu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40df8ec646---vusewufefibobadawenola.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada062c46f---budigabel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+merge+pdf+files+in+adobe+acrobat+pro+dcPDF 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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16760 bytes
SHA-256: 5b63c7551f60f23f880955ea14226188c3624fbdcbab4379d72b8130eaa90179
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 11180 bytes
SHA-256: 630509c2c260449110f85578eed5a0cdc16cbf4088814469c7172ae9a6323623
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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