Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a70a071ead03f8…

MALICIOUS

PDF

91.4 KB Created: 2021-08-12 10:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1681c3165f96bd1db57e6335f0dfa3d1 SHA-1: f8a8782065d6c6aa625320f257ccbc3dd667dd0a SHA-256: 11a70a071ead03f8a3944e5483ec3236de958024fcc25ea6a91ebfdf10ac6df6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=how+many+levels+are+in+kumon+math PDF link annotation
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/37563211791.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51dd61466b---16699987622.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/18039296987.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/setugibaripojiw.pdfIn PDF document text
    • http://katachizu.com/img/news/files/levigivivelekupewotu.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/tasemujefelizibef.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/33992477385.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/bagafofesobizawuvojuk.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113b3885c8ff---40519495194.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6466f9f7a3---kesemovupubinase.pdfIn PDF document text
    • https://energooptima.hu/upload/File/73494678387.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/dapezebogodolunu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086596d3e328---fobobovutopaletuxiv.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b2f7b1da46848c6f3e1843b71ce69c6/tavedunegamutibukazukivi.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/wupugopuxanunalidogagaxes.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02bec0e5b---kuvarinevagevevag.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/47948265049.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db06ebede7---27714514238.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/54172566120.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/wosizutovata.pdfIn PDF document text
    • https://chptravel.ir/data/file/74095657892.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/sudepawikiruxa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/dojoroduvosojebeli.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/suzobevitovadutipipapoj.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_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 10820 bytes
SHA-256: 67fe6d890e409baec142a11abb8a182195062eb2f88597747504db46810c7807
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 17104 bytes
SHA-256: f187a22a5e604e2a828e646a2d24e617eacd87aea144b5e3c66f1c43bf31ac16

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