Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d249033f59d3d7c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 16:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bc790ca4f1acf6582037383a96ab1a2 SHA-1: 424b67ef6aaa43a7e9a4ec76334de85b688e9982 SHA-256: 2d249033f59d3d7c29f6e89597b35c07a93289295439dd737f4ad3f0a6fa146b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=pokemon+xy+gba+romsmania PDF link annotation
    • http://terremeraude.com/userfiles/file/kikigotojewujuburubesepor.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/6767967211.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/56365857766.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/14/dozigolixuzibekoruxonije.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/gusifipotenukujakujegega.pdfIn PDF document text
    • http://abworder.com/uploads/files/38795102622.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/79580492119.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2125165e52477050039184d27aef5104/pemezusijimenadabak.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/79865988165.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/nanedidaboxogevaxibu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/33fb62524162489921538daf4c7d0b4d/26736220469.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/xobakaruturisimegodan.pdfIn PDF document text
    • https://limadelimon.com/images/file/buxufukujipavewezor.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210916_205FD14F6263155E.pdfIn PDF document text
    • http://modern-pro.ru/files/file/vitutemukebotovoxole.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a417029a7b---33776752118.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/jujulomebawenulu.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wafizejusowo.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/lexorenorowulo.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210910051130365559ckth1.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/26180393110.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mumebumiwug.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ac9b9bd05d408e34726cc3c2529f6c36/satimedopofod.pdfIn PDF document text
    • 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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10756 bytes
SHA-256: 1008e8817d721ab1dc28210a10ef1fbfbd07bc64e71bbdf5c3e82bd4ef47e3f9
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 18104 bytes
SHA-256: 2f29845e029acb38990df4b3313a32fbcf8221be8eac720911716914aa4fb6f5
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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