Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49fc3867308eac5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-22 22:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3eb3aa249414f4a5c529fdef2c6b29c SHA-1: b2d68ffd26f872f1eaddb650de2c206ab20073c5 SHA-256: f49fc3867308eac5ed9041474998ab362d1785572729331c851f2af9f6219eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://thailaundry.com/imgUpload/files/rivenozoguga.pdf In PDF document text
    • http://pozitron-s.ru/userfiles/file/virenilopimasetigudiboseg.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/1887163920.pdfIn PDF document text
    • http://cx-gl.hu/images/files/tojevikisurupojazimu.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/38783981430.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd774b59c---75064631411.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/678e96e1594bb51e16ee00e6a0a0555d/durevaselivomij.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/94779282615.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/mukadoxafaj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5a36a6d8---86134559428.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/8125649012.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98e3c5f4b---33643066796.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/gilemogele.pdfIn PDF document text
    • https://camphacement.vn/upload/files/55411688925.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/12643755887.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/91643785140.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/mirufolokoj.pdfIn PDF document text
    • https://renewone.de/files/58699908556.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80127402432.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e3533a6703e15877d77287d7f92663e0/82322688260.pdfIn PDF document text
    • https://jagominum.com/contents/files/11385194699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vicky+donor+full+movie+watch+online+123movies+with+english+subtitlesPDF 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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 11832 bytes
SHA-256: 592be3d3b28e715964c7e63cfcccd5e4fd96673a4c6a4d4a70da74129bd7faae
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 16472 bytes
SHA-256: 5a5567ec5f8839c865ec11173db1443350ae62163d65904acb4e812491ed4cc0
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1