Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77165f36a1dbd88…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 21:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27c63d84cace9b281fb824f978940fbe SHA-1: 6a707f96707b774bac376c2e2911190dfda9b9d3 SHA-256: f77165f36a1dbd88134d4d521a0a253d14f2883334328e18605ebf1953fb4739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this PDF is used as a lure to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=beauty+and+the+beast+2017+putlocker PDF link annotation
    • https://sindhuinvestment.com/ckfinder/userfiles/files/22998480207.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sifamezisoli.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kufewotefelimi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/be58c5c4a2c5469087528be649b92166/54564323395.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/83163200526.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/43cd89ab6e2b18a3edc2f160b7021f24/52874804755.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7727c764---41734196598.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630920693.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/80300989653.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/fukejurijejuxiva.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/88587336579.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913035813.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/96891187823.pdfIn PDF document text
    • http://masonhn.com/d/files/mekusomatar.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zugizusuriminewojudumef.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/mebujowotaxodivogazizekin.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/durinibe.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ruzowiw.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/61373075876.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/12770307918.pdfIn PDF document text
    • http://medica-brno.com/files/48083989683.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13f47e321---22819815726.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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 11360 bytes
SHA-256: 29c112f838b366bca37072d8389bd7615359ed7cd986167e0f80e52f1068145c
font_01_sfnt_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 17528 bytes
SHA-256: c5a72fe8fed501a0760f2bd60fb7672aef1cad7cf15e83fbde1bcaffe28e7873
font_02_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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