Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e890f409bc5799…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 12:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9560aee14581becd3adeafeb228b2ce2 SHA-1: 4f248e7e8fd1cb164f5625cde698e32c5e0ad4c0 SHA-256: 73e890f409bc5799f5a63bf98819d81df86e065339b8056d45eb6034ba19cd45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS upload storage, likely intended to host malicious files. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pretext, aiming to trick the user into calling a fraudulent number. While no scripts were directly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcd70663b---60756658191.pdf In PDF document text
    • https://gyandeepjkss.org/userfiles/file/fodupivirobewew.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/xovevenu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3931a5ebe6---60036322636.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/45733865115.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d66e5fdd7---68234298469.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/62304584755.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/ribudufevedegamula.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/sawir.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/27204054598.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/22347910421.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/499fc65d219074b6322fbe907407b6df/ropiruvireviduzisoto.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16227748631673034814.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff82163c7---99529653316.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9d3790d6fe---60538946910.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210617220321.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/birosupefu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/cab90d9a3b74a5975c20baae841e044a/joxixolamidok.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/paluwiteluwotutozoxedi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/904e787e62b648bb3e2ee3d696fb2341/gesitafemi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6b87b0fb03d03ff236a6f63788c65a7f/31513233897.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f21c53a79---xoxagoredemozokonuvojujat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=xmind+templates+downloadPDF 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_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 17052 bytes
SHA-256: eb20acf435c39e4dd73236a9984415650731a17e5df7e8cc7f332365f5c811f5
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 10544 bytes
SHA-256: c39ae320ef0283ff19cb5c1867a9fb1932700f0f4cf3cdd32a46799a0312ea99
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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