Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f741a7cf17bc1e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6c9a7988d27dba962c81185bca37416 SHA-1: 2eb171cc69daddde491a23a8ed3014a1f0c72320 SHA-256: 12f741a7cf17bc1ee41d05706e004efb457384dc1959e3f861d3e4bb242ea78d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://liweisteel.co.th/ckfinder/userfiles/files/rotawuwakewijosukuwej.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137a79661c---lusaneripisefelorofopeva.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/44090057476.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/57102441478.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/47693793370.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/nagesege.pdfIn PDF document text
    • https://banghenails.com/upload/file/79219046266.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/vibuxagom.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/56902393985.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/80728788698.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/sinegazofofajokifexidoder.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109131445533425.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///26815622268.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140452502970.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ca8f387a---tovesubitajewuzetovofobe.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/devumuwimuturinagoba.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/fasajuvep.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/58917256608.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7b2b32daa20fe0e08f8f7619cfa9828b/63589039053.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/togijuviratizigiwor.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/neludiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=super+vpn+apk+downloadPDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 17016 bytes
SHA-256: b09a4c5c6b783f667ab5d774cf0f01d33324b441d83af9567f3e1fa0dbfe3182
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 10444 bytes
SHA-256: 7179c34b748aeb27b17654eb0e20675f5a1c6c76a40c98490087c46712786a1a
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1