Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df2ee7c928ea837…

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d14f2a48a476d3f92c76c7779c4d6815 SHA-1: e7df0c402d0e62a1ef1a478ab5c7deb7a976f07f SHA-256: 9df2ee7c928ea83761b15ca8758a913a2e3d7f81a18c5560f5ab82edec8f22fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=newton+principia+english+translation+pdf PDF link annotation
    • http://polaryachtmanufactory.com/res/wysiwyg/file/gakugoxapemaxokevuvid.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/75559704035.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///11907558649.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/bodezaragigovoguxudo.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/57556118381.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5f97631f---21986931011.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/575622342.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dugoxu.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/2505332015.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/94792490612.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/31480742102.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143533436d3e---kajad.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449d7a777ef---majufudi.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/23236693772.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/rixovumimosozuwadu.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/74901423200.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tebatafitawivarukasuz.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/49819559576.pdfIn PDF document text
    • http://sivam.pl/files/file/83167473647.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210911055745_wb3g0e.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418cd6c067f---revexosuvajulu.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909033436.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_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 10960 bytes
SHA-256: f70cae80bfd8f12342c001b1bd25e1e94d8d9964b2be09f3519fff3e35e960ed
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 18832 bytes
SHA-256: 5885cda2c238991bf3cf924dec74875605ae8074d4ad744fedecffe2d326706f
font_02_sfnt_off0001434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1