Malicious PDF — malware analysis report

Static analysis result for SHA-256 6135745d60dd0ef1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 17:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68571ac771d2c2a8128a13656737139d SHA-1: 9b56a46a609b3000b0d8d88f76e13beaa8689ee8 SHA-256: 6135745d60dd0ef1452b027f02f32d6bf4cd30b6fd495316eea8ca10f4c3effb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. Heuristics suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700818d995c---24775599656.pdf In PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/84432808476.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/13187307928.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/29066036275.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4f2f837493a366a497854e977db0d839/taweguxogemigejum.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ed1b5d43d38b170733406131e1fb912e/91631966787.pdfIn PDF document text
    • https://mytopics.it/uploads/file/guxeluvija.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8514472c---45934086725.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6sgfrlag4ococeenkqca356hf3/gixitavoriremo.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/96055433706.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/rixevetebejed.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5839f3cb97---nimuvumavepegagoxibunodi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09bebce02---48799887872.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ab0d6420975da7c81db4914ae13ce50a/kizemefe.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/931m1j205kcj9doqmcvd5p8pi7/kekosan.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96c16e42f85aeb9f34f086ab08663fac/lexekakalawano.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/metuxuwugunugonepinaru.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879debbbbe7---73562253276.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cb238f1f025---56181754622.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/57023176701.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/57ter8obpq4pvlvi1giep22pmd/lubuzuvazavifixerimawes.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/671607276689eab913cdfb4188f144f9/37703099440.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/64778174883.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/sikenobebuvaluxowabis.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/783bb054b09bf36ccf1bd03ea403dee7/92373511625.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/28003209283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mollier+diagram+pdf+rs+khurmiPDF 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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10928 bytes
SHA-256: b535ed40c59881bbfcfab38aeafec0d3c77487ea1fee15a85fed0498bf0c22ef
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 18916 bytes
SHA-256: 15d681dfdaa810b37f4be072d7a00e6bc9d52bbf5c90ba13c745066eab7aa29c
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1