Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b95c19c53f2e7a…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 21:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3de072924f152810629c4987dc01dd54 SHA-1: 33337be5ba5b344ece6fb56aa4fbb0cdf60a715b SHA-256: 71b95c19c53f2e7a2273ec8a418682d7aa65c818a407fd3467fe36f19b3cea97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1b5a52fa---95682654324.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4b96de4ddca70146d7af4a52a30b44f4/2599472161.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kevalukopexiguk.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210517235345_ggaajf.pdfIn PDF document text
    • http://atek-ent.com/upload/file/mekajunabibavavopitobosud.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/gowiluxufetezo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e793ddf672---fefafaxuxibureluj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/30626233278.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80660180992.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdaa60182---80114565163.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/361bf0a34c50a49260ae645bcb970d2a/74502801479.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/faneturimoxenatopi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ef5b74e8---20479566414.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/simujogegonipuvagunizule.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099f624b1741---52874938682.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30df816524---51139808642.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c289ac2d7c5---fobaratigojalejamiparidex.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f445998b9b97874d0b6fb71de94fdbae/4528004682.pdfIn PDF document text
    • https://anfauglir.com/images/file/zutafuniduj.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/81620345304.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/3493225872.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/87ef716e927019b455c14d0e8095aeef/9694387700.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/n5qnfbobtnuutr9ujvf5n9gt1g/50959700104.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/23686206389.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ba1acttmo9off3s8bo53h2ap1/62218191244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=spatial+meaning+in+marathiPDF 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_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 17736 bytes
SHA-256: 5452bc0c34fd120e6b8939464d455c299ab96ffe87e577818447a46949e5c04c
font_02_sfnt_off00014d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4C 10488 bytes
SHA-256: 80fe5b633d4ef506647fd06ccbffc9953bdfaede9e7016d25ebc935f31dde2ff