Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85247c362a245c7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 04:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3537205f703f13c7f6dbf3f14f4c31f SHA-1: b805567ca46f28c6284614ace8f97eb42f6d3195 SHA-256: c85247c362a245c7b4aa08f1aa4a1c1157269664473eedd339af87aff52c371f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to potentially malicious content, disguised as a "find my phone" search. Several heuristics indicate this is a link farm on disposable or compromised hosting, and ML classifiers strongly flag it as malicious. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://genegurumiraclehealer.com/userfiles/file/fozojofav.pdf In PDF document text
    • http://suliaok.com/v15/Upload/file/2021916317352432.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/siwifixotes.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/5118368884.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/72319854778.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2afa2a49---bulunesesi.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/xogaro.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/37149490571.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/77422576158.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/rusozoj.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/sexaben.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613249f3a8fc3---silajizenogifudawuvuji.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lavasivurimidisejetevufe.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/sovufimebabojederirur.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/zevutiluwalurinab.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/92832065993.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9921dcb15---jujuberajijujuluwajel.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/95190139352.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af6107c28ec51b6d67bdeeefe45bb61/25316197163.pdfIn PDF document text
    • https://swiz.eu/files/editor/delevotokabuwufojoravuzo.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56230292494.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/dozebipawikilasoru.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/80495962235.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/birusutupidezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=find+my+phone+download+apkPDF 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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 18300 bytes
SHA-256: 7b075a4b4db9a3c14c0b224a8b3247d2d3512b5ae192e68c9b5e9c206c81fb76
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 10560 bytes
SHA-256: acdc06ea3d89adfbce6b045c1de425392436a3f87c594c8ea065fac4cc921ee6

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