Malicious PDF — malware analysis report

Static analysis result for SHA-256 697f532852ac4b4f…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 23:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9122fce3cf6d46f71525f7e1a157a889 SHA-1: deb7b93a2eb9de65356464dba7e20b1a7f679031 SHA-256: 697f532852ac4b4f0b4c5ef69f7beadb67e7a1160d6634f0869128fe1871c907
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://its-bulgaria.bg/files/file/wigegotujogulam.pdf In PDF document text
    • https://alternativecarrepair.nl/userfiles/file/41704983573.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/wasizag.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95fc48fa1---liwotijudepanepajazabi.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/jujuzujimixuko.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/soxotopitarudumunuzonawos.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2d3b15d83b3452d1f7bbab4d11bbdd07/vokafigufudutaleze.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/zodikewemejotulewo.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/1942667425.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f1770e3db---37458588537.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/vokenon.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/18430545657.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fuvotuletedinosarukawefok.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9571d201---58085396995.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/89846969544.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/45468803413.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/vufovadu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wokisemadezala.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/kiwowiwotuguwulatuxiv.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/87284794959.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/numimimufetigizowupeg.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/darez.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e8135417---69426848442.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/66395973449.pdfIn PDF document text
    • http://sciattella.net/images/file/39506366012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=top+best+fps+games+for+androidPDF 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_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10896 bytes
SHA-256: b6127ab5e5d461f484a3210b7050e1197717271580d2ce86063236648d596b3a
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 17024 bytes
SHA-256: 14d0c244a8c57a394e85898ad907aa28ede6fb175dab2f67c393a7371510de12

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