Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c8cfd785ea00a0…

MALICIOUS

PDF

115.3 KB Created: 2021-08-17 12:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e732fbbf1d388179e5fc29faa9ee4d96 SHA-1: 4a8d853875452bd1d9b4df036493701ac5ca5399 SHA-256: 82c8cfd785ea00a09c211875fd22f661ad4b62f0ed94b257223823f68ef8ab4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it functions as a link farm to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=fisica+conceptual+paul+hewitt+pdf+respuestas PDF link annotation
    • https://oncallanatomist.org/ckfinder/userfiles/files/tuxoni.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9c96c27b072cda4770bf4cead057a29e/pixonaravaberatox.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/60528715580.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b874a8f209b---nadijez.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/57321e9312b71fdb677d8f1bd0a4ec92/zupekebu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/32687211617.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/32473540128.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/sepipadofasaxob.pdfIn PDF document text
    • https://emmaushuis.org/pages/wanotugetonuduzes.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080279c6301c---tamunidadojigaberef.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2fd5d1e7272dfea363a007e3331eaac3/povolewularo.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/79532690352.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/dojuwovuzisuzadilona.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/23944157357.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/358307baae7291a64973925efb7908a3/losagi.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/bowarigobubetosuxik.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/2881624663.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/27497519150.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/79334156760.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ff1f1aab78f5d26d5f6234610cb68573/74152478299.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7ee59726d1874d3ca26a6f2c21aff092/46443171484.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160967c3b47542---ropinemuruziwogake.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/99426629513.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82c19c7f3---febosogufid.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/sidubuwalutipokarusomelol.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_off00015662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15662 10880 bytes
SHA-256: 97f49a80ff44050e662f92c19a65872af0c9f609c3d9fdf671419465ce923092
font_01_sfnt_off00016f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001879a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1879A 20724 bytes
SHA-256: a125bb61cac01fe05da545e6ee888a78e3e854bfebae12e13105bf336dcf133d

Open this report in the interactive analyzer, or submit your own file for analysis.