Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e94d98d790937e6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 07:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff0a2714d366143a18ba7d45989cb97e SHA-1: 7adb18b7171f0c8e57725d60f8ac1af002777f46 SHA-256: 9e94d98d790937e6efefea1f80645dc2a948d17a50a9712d934976961bc0c9e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a QR code lure further supports a phishing-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://servingltda.com/userfiles/file/vawamofopez.pdf In PDF document text
    • http://omatsuri.kr/data/userfiles/files/35129437742.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/db56549d50ac3a8ebc057c2b06820a32/tupokaboxe.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/watikaverawarovukos.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/26325407697.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/debalozitefobamime.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abef3dadd7---nisamuregolinare.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/raremu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/furalasujefuborupinotorox.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/89983322961.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tijigegavatinomefekotosav.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/jagasezonajomigopivew.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/42695122465.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/92254599919.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4af69c5a---mobipovivix.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219605179618.pdfIn PDF document text
    • https://alariel.be/userfiles/file/7530409771.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/12910452252.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/39954229423.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/samevi.pdfIn PDF document text
    • http://holzbau-napetschnig.at/xeroguzonatutamupinife.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/53683207407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=barcode+scanner+pro+androidPDF 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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 17816 bytes
SHA-256: c7af8b601d19ae544539f4e5656e52f72f778a1a5b7a920282d5bd5a494a9343
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10416 bytes
SHA-256: deb0823db8b6bedd91e22c4a758f0f1bd7760e80323dd712c202a63ec2d3b928