Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7753a84cc92557…

MALICIOUS

PDF

101.8 KB Created: 2021-09-02 01:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 628a1b8803b35a9b5ce268958ab0abdb SHA-1: 86394ef78c57f87bfc393f6f9bb691e9d76c553c SHA-256: af7753a84cc92557946d55d38656516afeeb5f9b9ff97450eef9e981f5a906a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=the+sims+4+cc+download+sites PDF link annotation
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f4288f58ea6f60e5451edc2b605046c2/72565060903.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5cc8b912b---69534507347.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/48040435369.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34651ac23d---40923658367.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa1fc9f28---68934062651.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/9bb8f06511bcc386db94da239ddeeedd/lukaxuxokerixapamuva.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xidegomajaxo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/noxazud.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8095755773ddc6380bfa0141f31ceaa5/wimajilelute.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/2791074547.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/nubowudibud.pdfIn PDF document text
    • http://isvpro.com/custom/files/xazukakoje.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/tevajifekitukavi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/waserifezatoliv.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/baganagomufono.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/majosasugizuwuwapusudig.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/53205673350.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5c3b9c8565e16f62104e0c218cf21ab7/74963811583.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835561b2c23---zapanari.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/31594636355.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c2a87486---43580977240.pdfIn PDF document text
    • http://cartopack.be/Images/file/dorojosozejaxobidoluxugik.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/45581123953.pdfIn PDF document text
    • http://riph.pl/userfiles/file/86411705063.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_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 18200 bytes
SHA-256: c27a8b26ac25cb61f7379762b00f573c39890f26fbd0bbbfc19752b7182ae8dd
font_01_sfnt_off00015686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15686 10660 bytes
SHA-256: 88f2c970c42daae640f69d84ba5ce1a9d888beb56a13ff1e4cb59ea30d0f8cc4
font_02_sfnt_off00016ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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