Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d63196b4c8f88ac…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 09:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0a78caa0af5282431315a4673e2d339 SHA-1: 049faec2c380393906567284035d3dfdd4370f1e SHA-256: 0d63196b4c8f88ac1f12d3a7b288e335416c8aeb42299364baf08f4aaf30a5b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://szabolcsipeter.com/userfiles/file/gasogizidepanula.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/31dc893b060f0c3d7c7f05d7e19b59fc/xuxexalarebepi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/97962959194.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210901181308.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8rgboqh2ef19qnju9qshmjk5eo/67512671325.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/52216334687.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cf267353---97110550892.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kugesupetiguxadudef.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09e58c6de---fososuloke.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/3294878090.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/dejejavovewupo.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xijafetifu.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/juradufofabove.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.pdfIn PDF document text
    • https://egca.fr/userfiles/file/87481339544.pdfIn PDF document text
    • http://someteme.com/archivos/_20210916114758.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/67537011006.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/vupopixiwipifaju.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/totelebofejejotiwax.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/41727727345.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/3387707586.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/fupopuxutesal.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/33707079390.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/79716320007.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/77608949249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adrian+lopez+alvarezPDF 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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 18792 bytes
SHA-256: 6b974e393358deefedbedc5de57a020fe517a2af2d54328d89cbe2dfc12d4d01
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10228 bytes
SHA-256: 1cfb9e37a6a336743869e019b3ff955ef3fc02465dfac6020c246dc3f22e293c