Malicious PDF — malware analysis report

Static analysis result for SHA-256 430c45920005a63c…

MALICIOUS

PDF

89.9 KB Created: 2021-07-23 14:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d45271e037b3f931c20d0ee4025ec10f SHA-1: db677245888a63db1f09d9139652e287443bcddf SHA-256: 430c45920005a63c5a9bcf593f938e4487c728fe96b909055e95a47cd3ccfafb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4f7266ee6ae2cbd34f68a74ec4b36fde/81523444355.pdf In PDF document text
    • https://silverwayshipping.com/userfiles/file/8347900659.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/71788366479.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf38b2697ef---metopefadiredenag.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd05089b1e---pezagofot.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f570aa39970---vezaleb.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ebb5c60e0---rokuwabesejow.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e29f83da9---wakepivetuwuniremegaw.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8ba6nf0c6qskqejab44qllavb0/75480687548.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/da30b5cfa7aeed874c22dea68503e519/zowebolijizapoziwu.pdfIn PDF document text
    • https://roc.mn/uploads/files/jatejibibuvitobal.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nuzifub.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe27ef266e---susomavamalaluxa.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210713042242.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fipogenawumajitifaxuvezo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/49868771437.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061712323140.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0e86a03acd486ee2a81f8b2fb1b7ebac/guwes.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3909ec22---vuzovetokolerawitarowute.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/38e50bd5f5de9755aec0ba4348cd4e54/vusisuwad.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/rekamemepom.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/11440307109.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3cjualhtd4lmj10p1jc2j1mkae/kokofixepasugomimunuzuti.pdfIn PDF document text
    • https://majubesar.info/contents//files/fosekuwanikekeketaju.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f58d3d5838a---4910472493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cuales+son+los+tipos+de+sistemas+operativos+mas+utilizadosPDF 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_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 10812 bytes
SHA-256: 8b1dfa55c33d37b1157da15479377888d086fb2f73bd57c1fd0ca83b8b729b6e
font_01_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 18072 bytes
SHA-256: ce09c92a0910c2cdc9fd5ee8373d40b1fc5f6904a072a7293f61c939287c0a6c
font_02_sfnt_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1