Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d202705ff3da37…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 00:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7e57f136d700bd6d8a0677be66bec50 SHA-1: f7219e7f220a9d3b7f977e85a393df00520bdb8c SHA-256: 52d202705ff3da37741d30f8f58afb7b471aaa4f34c4b7fa9162fd1b2667131f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://betamachinery.sa/other_files/File/zefonaxudixajebogowir.pdf In PDF document text
    • http://frchem.cn/upload/files/79551945799.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25790910005.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/32010874787.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/641910426.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109040102021380.pdfIn PDF document text
    • https://service-panev.com/userfiles/98625489433.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/12212017590.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/4091512544.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/lufosepi.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/85300943677.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/83143864224.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825b0233fb---52620037079.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8e0835f68aaaf3748c1b6a9377dc658e/nakudapivopuzer.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/depokudowira.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/55265129933.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gipijivukoxowasibulota.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/86902662613.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/didigijokikotixajaboni.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tiribelilebop.pdfIn PDF document text
    • http://119pump.net/d/files/87431264524.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/mewibijaropeparejufe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/30866859357.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134aac95002d---xifazaderelakodezizav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tango+live+streaming+mod+apkPDF 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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 20968 bytes
SHA-256: b883bb696064496ba7677c5aaab65078ab57b6d0f3375bbf7078ea69fbc99fca
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 10856 bytes
SHA-256: a1c2ed1a1a3956f0d4007b671dcfb54cf9ed60e32b2985d15b70c63fe68fd21d

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