Malicious PDF — malware analysis report

Static analysis result for SHA-256 da017fd7aeec4ccd…

MALICIOUS

PDF

84.3 KB Created: 2021-08-04 12:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c41394f61192f53bbf8dbcf086d1cf72 SHA-1: 4bd8c1b746ea29702f217d9ec5194e87153e4650 SHA-256: da017fd7aeec4ccda1fbff3dcee32704484e78970c7a901b045b30614aece614
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking malicious links. The PDF's structure and the presence of multiple external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2fe0bf089101fb6adb2cfb86fb6c54aa/fakofudozunetubizobinu.pdf In PDF document text
    • https://mttrasportisrl.it/dati/upload/file/32932292789.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8984f5d0d1b416603b17cd5309709f7b/jumixonazeduvakikaf.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/2643011241.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/391cai8o9o6oor42t2dlr5osk7/xadipusonizujulevo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a072dac306e---lumizubumojisujiwim.pdfIn PDF document text
    • http://tano-cable.com/d/files/jutubo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/53288807043.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e731b3d7cd5---zoxolumapekerewogigaxezep.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a5380413443ba2555feb28f4b6fe3b0e/62571590116.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/vesijiweb.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fq3tga183e1kokg5bsv357og65/58889789008.pdfIn PDF document text
    • https://adikkedua.com/contents//files/tuburamo.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/vowogokinaviduxoboduru.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5fdde83fac8e2134d706c6899eed8aa4/38802452886.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/64029035034.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160edb0e3072d4---37609510249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=blackout+arcade+game+app+androidPDF 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10936 bytes
SHA-256: b11eb3934aeb3f76807fa5803d8b9110f98b4ab9721e8c92d7c4f099630b48f0
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16456 bytes
SHA-256: c10e691c4a8c89e8b086ebccc41d1966db0a58535ea9df855bce95caf3a12d70