Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc3f0b9a8d95d2e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 16:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 792284973b0e10dbae0d8b1a66ab60fa SHA-1: eaf34004f263c485aa40706bc325a3df6b72a08d SHA-256: dcc3f0b9a8d95d2e89077ae3ebe79d7c5e47e4a6c168c9143cee0477f4db5a55
156 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 files on potentially compromised websites, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple unknown PDF links suggests an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tinnituskozpont.hu/files/82570042265.pdf In PDF document text
    • http://ancheng-medical.com/uploadfile/files/92404937079.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/61460300255.pdfIn PDF document text
    • https://nada70.org/userfiles/file/23200720887.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/givajefapix.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/01da5d800507f00e4303dad9035c75f3/vupipinel.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/sujevevuviritilititota.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/nawatapidajozow.pdfIn PDF document text
    • http://badgerhillfarm.uk/9944923955.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/dezabi.pdfIn PDF document text
    • http://lse.hu/userfiles/file/76116839207.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/10654676096.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613375a53eb40---74260712658.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/12765314181.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/56716862068.pdfIn PDF document text
    • http://ktcz.eu/files/files/47681707845.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394b62e63a---merisuzedobezuf.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161302784d1381---xanusadatolufewesogim.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/15434098597.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa105a36d5---2035369169.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/24737035571.pdfIn PDF document text
    • https://birudongker.com/contents/files/54278755529.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/leladube.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sepagomovurezulezitidiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lego+batman+movie+freePDF 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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 10504 bytes
SHA-256: 5851b54997e20c7eed3c9f0507094e046293f92327415ac828c880bbc92ee124
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 17764 bytes
SHA-256: 363a39ba5b4b6e7f695d90c379033a7a2566155bb09ef4287b84899036f559ba

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