Malicious PDF — malware analysis report

Static analysis result for SHA-256 082fbe04a7ef1752…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 11:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10de73ecbba0c3867a62490f11db7ec3 SHA-1: 9aff7d41c8c655737eb5c0418ad23f3c119afecc SHA-256: 082fbe04a7ef1752b3d5fcfb56d8ff94cb2663a6488a70d2ae9b6d5e81484bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

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://krisoc.ru/uplcv?utm_term=really+achieving+your+childhood+dreams+pdf PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c889c77fb10---noripotuzazulavevozovaf.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-24/20210824094221943886.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba584817d74---jusetogilog.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0eb3c22de6789afd370d87f4a9c8238b/seruwomosadesubofasa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf4221cd91---82142841902.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb5522301---4490151325.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/43419085602.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/37669285986.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/56846499506.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/gipipafajivanit.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/repuvemuragog.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb8409704---76093343545.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/lexuselezag.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/334daae5feebf3b1130352f4c0407c2e/35525580918.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/lutani.pdfIn PDF document text
    • https://gangnampools.com/contents//files/sipaleropisubonurav.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/fipobiz.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/26935149865.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lu10iraj13arpljj1h6gn8pf0j/66949433569.pdfIn PDF document text
    • http://beiks.info/public/file/zatenizomefikelafovefa.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/futuvubogugirine.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dad9c1bfe413cd082b6dbbdba29e31ec/14089072108.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/zuzidulavabizetof.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/xezawopijurom.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/54559280539.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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 11292 bytes
SHA-256: c27a734db01e0fcff28cd3a09c4b4d2d131e56821d865f3cfa6e79ec7e132e36
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 18208 bytes
SHA-256: 32c129026e1c1dba2162a42b9930d331816e012b2ca739c7c966abe444a512ce

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