Malicious PDF — malware analysis report

Static analysis result for SHA-256 07790fe4b29267e4…

MALICIOUS

PDF

76.3 KB Created: 2021-07-21 14:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99691a76fb306d4e7d52eb595e66c89a SHA-1: 914fe1d5a33da1b1194b3a09ed3499aeef5079e4 SHA-256: 07790fe4b29267e46a6caa5d28234b63f28e7059f9767430a7f9e8aad60300bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://happinessgown.com/upload/users/files/64165497042.pdf In PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/gosuv.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75f49361d6---futitibozefugura.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/df7fm4jrt5i67itjqcjke4pop1/78947481986.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/jovewafurulu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c4546e4f14ba3bfd2e60c112519513fc/13516174365.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/pbe2lnubk6ssdooms8hac43umi/69358959617.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c46b4b1c4e2e2489d7cd403820c31276/34022749597.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/linelo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a028812ff22---14728093503.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/86018068503.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/37fd82faa44183df3e2fe8c500da02f3/ritowita.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cce66957---83636487928.pdfIn PDF document text
    • https://noddy.nu/images/file/wasaxomulepowuron.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e133f09b2---88679275326.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7a116ddf7e07bdf4c97921c7174e7a97/fupekunepiruboledeboj.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/gukumegabowarolu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d75a77ddb6c27f711653bae4d1c2abb2/41893017042.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e529aa87672678f86972f63852378d28/lesagikipivuzu.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/4996850383.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/83225147008.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f2c2ba67---17823521407.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1i369gp7q581hhqt2r6t6hta93/duvalujomilimi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/531598050972f29253f16f40dd58672a/3690701918.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/79020988630.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd313b33ce---17997303349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=isometric+drawing+cylinderPDF 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_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 16152 bytes
SHA-256: a3aeaa18c39b346eebc350484926035d3453ba34cc43b57379de41f9549d0135
font_02_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 10864 bytes
SHA-256: d341316192c46100fc8f86bb5c7a5f6786ba91d661920d450447e86448bd3816

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