Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0cbb2ec0bf9353…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 22:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5c32d1f709e7f541476cf4eddbd792d SHA-1: 47d03d0449a1dc77948393e2b30c718b44b6b035 SHA-256: 5d0cbb2ec0bf935347b175202ff8c57a29d6dafb705e61b1231d1ef386e755d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161316b891bb5b---gepemegosa.pdf In PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1356716580.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/wedemo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/xotepirisi.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/45961178948.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/77902308043.pdfIn PDF document text
    • http://client.diffuse.info/files/wepinitefajilepizekuk.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/zulojikatav.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/97411048545.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jetuxalaruzas.pdfIn PDF document text
    • http://355353.ru/userfiles/file/53483910857.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s8uo2q5gq1penkg9cg38j8og11/68678380608.pdfIn PDF document text
    • https://agatanorek.com/files/file/7848137927.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/wevitakupib.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/buxezopak.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/xeket.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/91304277495.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/gazadimiripeg.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/39039885875.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/mosoxopapovel.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/nipelezeginex.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/55518259084.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/22666464651.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109271516481504.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/mewek.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e97737b0c7---karibaselawavozokezukegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=htc+desire+hd+roms+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_off0000b13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13A 10712 bytes
SHA-256: 020e19dd543d7e26bf7b28c26e2e7b0dcf191d314d7497bfac5af3e0f6f4ced0
font_01_sfnt_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 16072 bytes
SHA-256: 5746595673484a7c0decc062fcf29fc620b7ab3f83180697c3d45bafd78aca02
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1