Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad36c309839db94e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 12:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d3af6c8744c921cb71fba63731b909 SHA-1: 6e117a4ef1dd82d8ddf3ce86de4d5138c50498de SHA-256: ad36c309839db94e007c7cb0711ed8adbe9c73b62a12c6c4879ba828b1f02b59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress upload storage. While no scripts were extracted, the presence of multiple links to potentially malicious PDF files suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe04c71554---33785307885.pdf In PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/vadukoguzalaredajulo.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kabawavaxazara.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/94077837027.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/6312556499.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/82583823702.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/99011214987.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/ledinejevazoxanilupudan.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/22311657775.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/84105228273.pdfIn PDF document text
    • https://maria-galland.ru/files/file/38964697353.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/turozupu.pdfIn PDF document text
    • http://planbmedia.hu/files/pupez.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/zelesowarixexobivarite.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/29072545888.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10574622426.pdfIn PDF document text
    • http://juentai.com/userfiles/files/pinipeped.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/68253807895.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/fc5285.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/zujuderavibetax.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9eb66df1---51185915679.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d42389f62a0228367933c043cee06ddf/tunukefajezaxofedurobow.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/45191861467.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/turamuxiwaxaxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wrong+turn+2003+movie+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_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 11084 bytes
SHA-256: e3e0f9324f7aa7d2f2a0ddd97176d3caeda67251c57b2c891b6ab28f793c832c
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 17224 bytes
SHA-256: 47acddad2937ac477bb109635d825d9fbc3132238d558108de3ab20f3f86aed9

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