Malicious PDF — malware analysis report

Static analysis result for SHA-256 980b97fa7a93e488…

MALICIOUS

PDF

94.0 KB Created: 2021-09-04 06:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d07c8b012197ff4425a3ff9f07d829f0 SHA-1: 983151a32759c3916e79c70c468f859d63ed2ca6 SHA-256: 980b97fa7a93e48845e87306ccbd536cf9edc66df761c5fdf65a1be24fbf7af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://nusamulticentralestari.com/Uploads/userfiles/files/57041166774.pdf In PDF document text
    • http://acpiindia.com/userfiles/file/7059481217.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/fejatedu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/v300q0t5htrrtm8upku6e4iso0/28242302258.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/48477483599.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/wututatil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95cd553b0f---42921773418.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vvts0t3d6p8kq5vd60tiesquh4/fevunavitepapik.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/24822854267.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/52920186778.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/65227115357.pdfIn PDF document text
    • https://ancoraeducacion.com/images/60666514262.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8c2ac709ee1ed417c131525ffd5f9b86/4644550253.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lipegokejisasanug.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3dc78ea9e---79000367959.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/74903866526.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/4697979408.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/13030165222.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/98078722879.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2d06f91a---zejixiteviwitijuvore.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/lesezazemipenujumojar.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/telipelomodixe.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/felevaf.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/12442224406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=laws+of+thermodynamics+in+physics+pdfPDF 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_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 18420 bytes
SHA-256: 90d12dea0a9d4f473adaa6f9ad3a9dab6039dea83909e292f5c6834a93046411
font_01_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 10996 bytes
SHA-256: 24ffbd40ad964f29d6ecf072be669c510e7527d55115052b2420d8b972157573
font_02_sfnt_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1