Malicious PDF — malware analysis report

Static analysis result for SHA-256 110dd2799831e3d0…

MALICIOUS

PDF

114.2 KB Created: 2021-08-14 02:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ff23fc2ae4e5f891901a46f92abde2d SHA-1: 5c7c9db37daa000fea6ac9c4ddfd9d4c736fa37e SHA-256: 110dd2799831e3d0b1e9ce069bee7295e373326316c955f36f0a563d4e2d5230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb7322a59---40721524266.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/sijamekomimeratogire.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e0881fed---62728267310.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68f5ae22e249ec882e033948f1ba296e/dogidodidafuvimi.pdfIn PDF document text
    • https://topupdana.com/contents//files/31942106827.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d092a75576---63603760437.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/jasulo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/zolazifolekatujojin.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8502c11af---nidus.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/81440764479.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b17210666---desikovaxirewunawupe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/02e4deb89bd9ef926b04f7812d7fbe60/28977085838.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/lugubimazofiz.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/lepeziribakujafuso.pdfIn PDF document text
    • https://rjpexport.com/files/441775269.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/17450369283.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/42210232026.pdfIn PDF document text
    • http://ippon.lv/uploads/File/2966985703.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f10fdf83900b609b27efd21c1fb4613a/22652640565.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/23927150647.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zutuxagawunojofuvadefo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d5f268fce---dolotavozotopugiro.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/136308561061155f09274dd.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/27763097206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nissan+25+forklift+parts+manualPDF 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_off00015c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17483 10812 bytes
SHA-256: 078b02ee2c725bbdc1eab66512918f533d23f3d1f07a0e0fdf850e9c443dd1bf
font_02_sfnt_off00018d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D83 17172 bytes
SHA-256: 7456304815db8ac0165c54213a288b51c1f918bba33c4bb9b21aa03a57807faf

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