Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b967820729c8fc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 17:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 936ad9b574186f982b979bf44f46d091 SHA-1: e0dc50c332fa40bc4186235455dbcdfddbdb2f49 SHA-256: c4b967820729c8fcd1f5034f0ef18e290d412b3672aa95cbef1ca7f9043cbf24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oklogistic.lv/upload/file/resezanigasilogun.pdf In PDF document text
    • https://polandpools.com/contents/files/63353723677.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/wutimufubafemivugul.pdfIn PDF document text
    • http://coachhouse.info/assets/file/31036216559.pdfIn PDF document text
    • https://fishuntpesca.it/file/72657340700.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/xewemugamisi.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/71256855063.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/lijodorijavavokimetevuxox.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/95868365798.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/69a88a840db9d27ed40326214c977f63/67128275650.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/bazap.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358162edee9---68488089348.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16147c70df3f76---vewozugusubojofuworajuna.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/128290927561487bf5d95f3.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xogerupite.pdfIn PDF document text
    • http://kco.su/userfiles/file/60625919761.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/fuxaxumo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361663ce978---jazajiwejobekazimepukuj.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/zekatavazixomunenolib.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/xafoverolig.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/55358107140.pdfIn PDF document text
    • http://innersolutions-uk.com/file/46083893607.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/99041269039.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/95751182515.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29164437636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=floating+multitasking+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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10532 bytes
SHA-256: e862f5af4bc03d7375a2577705ee0cd4c044cd6fe042d505d23969b2f7e4dfba
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 20236 bytes
SHA-256: 02b9f6725bad1906238cf17d4ba85197efc03a9a77f8eaf4bdb669af160ec1d9
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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