Malicious PDF — malware analysis report

Static analysis result for SHA-256 107bd221628b4d88…

MALICIOUS

PDF

107.4 KB Created: 2021-06-26 08:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d2d563b7b81a2401f48e2e1fb56a07fd SHA-1: a0729dff69c37150d7509a12f0983d74c51af25b SHA-256: 107bd221628b4d88f06eaff3c2fd3d6785bab86ff1f4a57b4314a7f4333d8d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of embedded URI functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=the+demand+curve+for+an+individual+seller%27s+product+in+perfect+competition+is PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ee75767f---nulaxanerepidom.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7d03aba38---tarevirumivisivevorufape.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087818e6544d---jizogonof.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b6273c87fa9f3c753a323b5c82918b72/mogisepawiwazagiduw.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d4b8c4e68---rizofafusug.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1623384592711412139.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090933d761b9---65673161145.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af642500ac0---nomirokovarikovazuwutid.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c5qotquobeu2v9j33ke1bvonhu/21668560914.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/70436168680.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a97f94386---rokodud.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072816101588---70963873888.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7c73da5e8d1d9044300bf2741707f472/95618551675.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/30051457273.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a80eb557---59142289265.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wuzuxirijanijadajumaka.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17bb1fd25---15022356211.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/20242538011.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/xubupujizanumebital.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/45630707647.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd365dcc94d---xoviraxuzepebosomunekusug.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/22659928865.pdfIn PDF document text
    • 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_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 17532 bytes
SHA-256: 71e42b0a6f1530263c7803a5fed58e45a6e650d86f1207255b72a717574bf7a9
font_01_sfnt_off00016ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDD 11048 bytes
SHA-256: bfb974783361f22b9a574eb8db54e251c1158a6ce5b5fd81c103bf68c7f5dd0d
font_02_sfnt_off0001876f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1876F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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