Malicious PDF — malware analysis report

Static analysis result for SHA-256 f491cf3a9b458d0b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 00:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a22028090cc85b7834771698506f1897 SHA-1: 44aae2994fe278c6f67a945cdd4b8a9475be1b92 SHA-256: f491cf3a9b458d0b7e24bda5839062eff8798b4212af9875618e12c8aadd8a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to download potentially unwanted or malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sim2007.com/files/68002393878.pdf In PDF document text
    • https://cobaltinc.org/userfiles/file/73270841837.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/25924078162.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/31668279785.pdfIn PDF document text
    • https://edgecs.com/documents/sezatodi.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/8391611128.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/30091232378.pdfIn PDF document text
    • http://ned.ru/uploads/files/50181779614.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/8612508084.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/32478480471.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c0ccd93bd6aadec2a5a5fa111ec54c58/tinewobupixixagupu.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/76703701504.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/76009216286.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/78648664932.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/86750805513.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132681750516---26991578068.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/51345465293.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_5C155389D5BDCF01.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56300477263.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/67905618448.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/zalurit.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/562af657a795e8493926a451881689ef/19359665135.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2925dcf1cb88350af0af056defff1f95/95182485290.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/48977455197.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d83dde13c---83219589597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=action+launcher+plus+apk+downloadPDF 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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 18628 bytes
SHA-256: 2acba2708a72b5d91ec695419e470818089bbf77cc710ba1fc06612ed98b3d71
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 10868 bytes
SHA-256: bd2fa10ff1a939dd5a6285b98b0d7c8907c1dfafb01f208e7c8acb5e10ba388c
font_02_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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