Malicious PDF — malware analysis report

Static analysis result for SHA-256 b815a4b8d54cc046…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 22:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76a365986034cb563834fae496c7cefe SHA-1: fbad03c5cb0d1d0834bc68df64858264036e8274 SHA-256: b815a4b8d54cc046fa355236dbfa80094a1f3ad4c1111c65f44f986e023f1482
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://getwealthythisyear.com/ckfinder/userfiles/files/xupadog.pdf In PDF document text
    • http://deforma.it/userfiles/files/gawojakagokokuxoratalekul.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/2559649166.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613704c055791---30274746283.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/35675861295.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210902100937.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8c9a17333cfdba2e0b43dd3f49ec098f/xotedupoxugotuvumonut.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/seduvuligamezumu.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/ravunezazeliresavuwowekip.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/32476960510.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23521964079.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021962334167910.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/37166768346.pdfIn PDF document text
    • http://www.buildonhope.org/file/22110135275.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/mujijagunakelifipeg.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648b967eea---52903165206.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/gegotinugagomemikixefas.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/23044045282.pdfIn PDF document text
    • http://c-six.it/userfiles/files/25103977632.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/wugerorure.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/36559504775.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49755417212.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/xipuvozezopuzavavafetuwel.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/kudivowuxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=indian+train+simulator+real+sound+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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 17216 bytes
SHA-256: 9c06144baa07ec24de505d6027fd0f925d6bc4ccd76ee252d841255dda30c8ed
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 10696 bytes
SHA-256: 59b82cac8d75f029033e28d23bde9802e0c4d801244a5ae30433f8e3aa7ab0cc
font_02_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1