Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5736cafefbf6987…

MALICIOUS

PDF

117.4 KB Created: 2021-07-21 17:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fed998da09fbed46f625fa3afceb509a SHA-1: d7e8992334e721b2a1c0398266028fa15e54d874 SHA-256: f5736cafefbf6987a61886357bc3822ad08786d826eabd37f81b544ba441e4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://roxburyhs1987.com/clients/63080/File/87441209376.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0a6a94293dbc6dafa934b16fbf03ad77/86284463964.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/firumojolevo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/fokukedepiniduvifawofezej.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/dikij.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/xubom.pdfIn PDF document text
    • http://df-foundry.net/d/files/tupiwi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f25c3ccc---84071489511.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/89665827405.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kibugebexerilu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60962563520.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/53115175195.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/425177614996e500005d4026bea917bd/diradafovurenodipeledele.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/93fa41ce7b5564a50525daecb6491f86/soxezulofapewip.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e46308785---7034614702.pdfIn PDF document text
    • https://andrejc.si/files/file/salinevexopogoxe.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/lezezapulesinetosusejorep.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/19222030089.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae582f077d---robaxavosowed.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1288959760609b1e2b0edf2.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d739f34bd58558f37ab703d2a696d890/56718589111.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43c847779---zetofu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lofarasodifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=arius+heresy+and+traditionPDF 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_off00016d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18555 10492 bytes
SHA-256: 38b7910bf50167c88cd60f4d0d5b35b850be174df3ebb27aad2927a8e41e399f
font_02_sfnt_off00019d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D39 16756 bytes
SHA-256: b63789b5687b13bc5b7a256de5c926e8a86191f4d1f1f16d5dff929e75bd9058

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