Malicious PDF — malware analysis report

Static analysis result for SHA-256 4240dec79d83eda8…

MALICIOUS

PDF

96.3 KB Created: 2021-08-22 05:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ae1818f1c867d3e1fa828ae7b0d3774 SHA-1: 4a883b8f153d8578f4fa1116a4ad146f0eae510b SHA-256: 4240dec79d83eda85dd0b9eb5a03bb27be8b0c3c32b43a2c48d2d7cfe91d888a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://nbkhjc.com/uploads/202107/file/21072915270633646715ov116ay3ft.pdf In PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/gorizixi.pdfIn PDF document text
    • http://bscartridge.com/pic/58720280310.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/tajigumozinofen.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/30769466555.pdfIn PDF document text
    • http://emaaravm.net/upload/files/82032677784.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/88197217983.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4fc099a9518b0aa8c3e78efd6ba95921/murax.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dae82ebcc---tawap.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/48d27547fb2a39327c89cebf5e5e23a6/dagiroxejagetu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c35c739b3b7---pekupedigerinoliwuzal.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c5c30b8c3---28831606172.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c1e95d0f83993c5a0a52551e00db9cc3/barulo.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/sijigamevokeded.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/duvuwepipafadoj.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/71097072059.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/65238700460.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/16537152212.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/17439002848.pdfIn PDF document text
    • http://video-cycling.de/files/file/fativogoxeg.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xugago.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b75156477---9024696276.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/664044ip85php09uikcaj4sg4c/98922510354.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/vijaregu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=emt+medical+scenarios+quizletPDF 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_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 10820 bytes
SHA-256: 5e310f0df200d8b9997b3a2ab6622a12c6c72f9582d9983350376f8c5e0bf4a7
font_01_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B1 17756 bytes
SHA-256: 1c6ac67f83e20396d5c78ff0ffbffe720ea8d176f790b9ee65929bab37b630a4

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