Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b65fed6d7dd373e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 17:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7180d6486ac3488b71a6a09c256532b1 SHA-1: e4139cfbc5edcb1eeabb8c463db6f99fbf7f1108 SHA-256: 9b65fed6d7dd373e5c78cfba97f231eb1525f5bcbba4a7af6b274328010f0574
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous links on disposable or compromised hosting further reinforces the malicious intent.

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 https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/g42lq5svm8lfauc72u14l0t3hu/mulosiwegamemidagopo.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c419872889---zevuxoxawuwekosaw.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2505ac3d3c---25129769790.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c552272bbc---tinotagezakutebagitivaf.pdf
    • http://laclonghotel.vn/upload/files/kuvirovudirako.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/356be339a7124102cbb1a157fcde5412/fefaruvazobeporiledukud.pdf
    • https://nmcs.ca/userfiles/files/39173736426.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e138f9f2fd---wigodekagedisufokuwawa.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607755a674672---fewoxixanatif.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/joxuzusabekigobasoganesuk.pdf
    • http://rolmech-strzelno.pl/Upload/file/linelunuxuwulijikasetudek.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f300d56ee---91495084537.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/825834183b982d57fbc7b8f46736452e/84320660561.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7b1b8374a7972a62447fa264f0b88ef8/bafopimupewaruzuxivodumim.pdf
    • https://classconnbio.com/img-jacson/files/11746917875.pdf
    • http://hongdanhaudio.com/luutru/files/52480284363.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=where+i+can+find+slime+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff2.bin
f7d045f11f04d781dd2c76e009f31bca83cba376b1707119c2f7a78f7c734b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16964 bytes
font_01_sfnt_off00011c70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
font_02_sfnt_off00013487.bin
dc5e75ef00d70e3537b3415c8099ec3e948ac9c2527cdc339976a1c91ef2b121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 10616 bytes

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