Malicious PDF — malware analysis report

Static analysis result for SHA-256 407b4c34472222fc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 11:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2bf323a0140d7259ba8a0710ff946ccb SHA-1: d7ec305f5dd6a47b801d81ccb3e5aeb506760c5a SHA-256: 407b4c34472222fc704ed8a613367c8e1978b61a50a825413464c4aa9d80ecba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the structure suggests it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a074a32977d---60662159526.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608616db1d6e0---97502334383.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/gugeveguxawosewexa.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/kemajunifukalepatekesatob.pdfIn PDF document text
    • http://orem.mn/uploads/files/92444293351.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/86426533184.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/rofitopififuzoxafurokufa.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611918e4c4763---76988028393.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/19980218503.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7855efccb2093d1c914c01d51cfd9ce0/18211172596.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bc35e8242---99889665729.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/40602769871.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e136f5bce6---bixutunazolewozeziso.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/jb4a87c8h2akorcg1oc6h228ic/66411512529.pdfIn PDF document text
    • http://lawngo.net/fckfiles/jifololigesojuxetepix.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/45878583082.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b67828a06bd---zupixumegazuxe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b056147f7a2---52983765285.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/841c2d325dd210fbf58c6be22a752302/nodugekazakorinikedidewe.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98f7d3cfeb---55441881640.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/93591618367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=inventory+of+complicated+grief-revised+%28icg-r%29+pdfPDF 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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 18864 bytes
SHA-256: ff5c4a4f8038a5b0fc493a446cff2ba0598b7b0e06778ef8c2f5d9a41ccad302
font_01_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 11284 bytes
SHA-256: 29cf5f32ced566bb90d9c1e17ed772c430d9d04338979c4cc060c13bcece490b
font_02_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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