Malicious PDF — malware analysis report

Static analysis result for SHA-256 5315321493bd6ccb…

MALICIOUS

PDF

91.7 KB Created: 2021-08-11 21:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8d6085cc0c84e20018db24dd3070fbf7 SHA-1: 778922804d5d1d0ec39ad8b183fae877bddfa659 SHA-256: 5315321493bd6ccbfffbb17235cea372a264cb50763256d191e0932ec4622324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://thephinhmienbac.com/upload/files/10559044050.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/33f4d4ae931cd028bc5b2abbebcbd898/90973139938.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4fac3344c---gupumizisisuxox.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nbqggpt2gmier3n9dl9r9g62p5/jeximinuwizig.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725ef207dbe---rosiwenirenunesur.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2a561af4b7ea3eea32ec76cff07735b0/58504632272.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c0ce1262238c2140c9d2e9a255f1a8c1/61173806454.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/1664484763.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/59c86rqmb1hme5ito7in1josi3/tebodiwukutalolurogigebu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/212b60918b46567f9159438e40dab28b/49950468347.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mowisukuwolajaxilefari.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o6hgn97rgjllkossaok7meq0f2/gomuvowojifovidukowor.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb5233ec4---wijazilegogoti.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1143c2cfcf---41592265479.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/58920008614.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0067a3788---femeb.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/zabatugulosipakitagofa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6a4148d6---runoreja.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/091e43898a532e3f93df249e519acecb/79623715509.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210801_9A0FCC223F529FEE.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hq815ufs2p0op5238ut2btbu4q/31297329308.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/34516368316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+change+temperature+on+cda+wine+coolerPDF 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_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10968 bytes
SHA-256: 7063d6fa096ab31811c7baebe266685e1a9e7ed4b375b681a282150d19dc0cbf
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 17976 bytes
SHA-256: 40a465ec411f85ebb69f9e1a226634c10eab12444ab0f3a2797bb394af0f6620
font_02_sfnt_off000148bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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