Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac04f185851d4bb2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 15:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 133d224f4abb542a07654af686696f36 SHA-1: 51ce0ed5e05c893dd55db128af5928e6ba510879 SHA-256: ac04f185851d4bb21ffe183ed6dc7669489845cbe19ead5d9d26eab8b40ae444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics point towards a malicious document, potentially leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=how+to+download+ringtones+to+my+phone PDF link annotation
    • http://sicilalluminio.it/userfiles/files/14354711647.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/jejomozojikeretolujakofe.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e00be3195e5131f0a8f70262e3b07d3b/74174414278.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d261835a5---51024758456.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/15686763802.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/zefowudaxur.pdfIn PDF document text
    • http://ridendo.cz/files/file/25542160954.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/zibexebabirusuvuwumoxeb.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5141afd401e13eea42e9906f8a19f4b3/32214220551.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/xedazatukuzafamevebabumeb.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/raxunipisuga.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5b5fb1bn9gk00e0pudpb61jfv0/36429952793.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/60955366069.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/11988017615.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/18908008543.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/bakidif.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/bagibut.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/fujuriwina.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/daxerobow.pdfIn PDF document text
    • http://linker-apps.com/files/90689606492.pdfIn PDF document text
    • https://drlanda.hu/user/file/mugiwutijurub.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/bosepakasaweboto.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/52456692247.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/12814969180.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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 19544 bytes
SHA-256: 43f48998057b712b86d057e0f907688978207a381a155fba6141c573b4733399
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 11028 bytes
SHA-256: b6e03b6f002f857818ad0cbe39cfb103e7729220bf31038036f28f4875400b67
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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