Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fe6da0067f29a9…

MALICIOUS

PDF

108.4 KB Created: 2021-09-22 21:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8c8e249d164f55b3ff48170f957e8b9 SHA-1: f40efef7e7bc56ea543bf1641d47d2a21112ec2c SHA-256: 77fe6da0067f29a9e504732bc3c7d4700f2d3f0bbdd910f748d27e8ac9f16982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The heuristic firings indicate that the PDF is designed as a link farm, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=silver+blaze+sherlock+holmes+pdf PDF link annotation
    • http://firsttimehomebuyerstudy.com/images/file/75630429336.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/dewobakututapapomulazimug.pdfIn PDF document text
    • http://surtek.biz/image/files/20150328_124214.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qfuimok4kolthnfi089a1e0st6/54511947554.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/74069333909.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/99268685188.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/58938893432.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/29841231594.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/zifurijovevineram.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/31282718796.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/52740082555.pdfIn PDF document text
    • http://ch-yang.com/upload/files/toneximiva.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/73186887833.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/51665165889.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210913_2AC430232ACA71AB.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/91098833927.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130174a2b509---tojapukimup.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210904233709.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/90564215434.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/80142815283.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgndreru5mhb31g61anmnr9tjc/kawuwevoxu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/desasonukemowoni.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/jopudejawifoloramasiriv.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/34111030641.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_off00013966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13966 11116 bytes
SHA-256: e53308bb0c994e6f870a278f8838f736c919f855adae657a5efe153a3c12ba81
font_01_sfnt_off0001531b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531B 22228 bytes
SHA-256: 95575798a3b653c767f2d43e431731735a7886b05adb59643ad29ba155ff5442
font_02_sfnt_off00018c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.