Malicious PDF — malware analysis report

Static analysis result for SHA-256 4118d5e293e716c4…

MALICIOUS

PDF

89.4 KB Created: 2021-08-07 05:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7206de08b5c6cb23d4bf5c4d62775c3 SHA-1: 897afd7fc2499a4337892e0085d8d6441f143099 SHA-256: 4118d5e293e716c4ab3a8c3f7568c1eabd05088d61de3e8a5368fdf4169400f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7e018922679472024785816fc2b5fdca/fowolutuzajisafezuda.pdf In PDF document text
    • http://cortabellanews.com/userimages/95265055638.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2bf212074e0f3e2366cb9eac934aee2/42165244397.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/9236132181.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/57428534705.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49dbde3b48---90062353165.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/19706607685.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/56604540028.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11500643206.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vijisimikitalijifawa.pdfIn PDF document text
    • http://nessium.net/userfiles/file/4909871915.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa2a8822e---99175834149.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5smae7k6i8ccrijonp5j85foqo/xatanivoruwidunaxuw.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/repuzev.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gazuxaxumikotot.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/7912976337.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6ad7a808ad1b8bf1b56b964e2a6049f/21226114228.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/54147606430.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ed398bd95addac8a700a1c51231ef82e/tugoxikivunibelowis.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075a490f1faa---14578088655.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d8621d48c---danamipifewa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0e69d423ae2c019bf5d3d52119b7150/wozexide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=maquinas+simples+polea+ejemplosPDF 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_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10584 bytes
SHA-256: efad9436644127ec7e055f57cb6f2f70b9ac71dac4ce967436122dbdd67dbe15
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 18000 bytes
SHA-256: 4d2adb3c753e4c2a8c59504515b7dc1689426060e680fa7bb35520d7deee9a92
font_02_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1