Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa7bb9cf88269ff…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 07:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec9664e7e7dad7cdde8eb817f1124c39 SHA-1: 9f54d991dbe03e581ad17645ab577f74a3cce88c SHA-256: 9aa7bb9cf88269ff50d2fd5d15930a2310443ed8e31ed8311f24f35109e42265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting an attempt to manipulate search engine results or direct users to malicious content. The presence of external URIs and link farm heuristics indicates a primary function of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mbeautyconcept.com/upload/content_images/file/mubesimavukozi.pdf In PDF document text
    • http://taihegas.com/filespath/files/20210909095536.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xokema.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/duvasegogata.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/23134037210.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fdc3b3d57c6bbf77fa63ded5b3939b5b/zajokunakozopefo.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/jolunubaguj.pdfIn PDF document text
    • http://mamitobe.ru/files/file/69324726370.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/mulof.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/7799230142.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xikerudeboli.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/gezebomexolavif.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/11945156621.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/17815848367.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/96839299105.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/44411103340.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bf266f4e5f7ba1f30ad263d7c9bf1e03/jujokubotusafozave.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6700ac407---razuta.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/jubipeti.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zukavukagogedadip.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/parob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bluetooth+not+working+on+android+phonePDF 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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 10836 bytes
SHA-256: da774e76b9eb5d623fdc9295f8e2f44febe459d03dc249d9cc24b69f46d2e4bd
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16108 bytes
SHA-256: d3933f891208608d7b4b8591c7e9d0ffaa6d35ac6aa9410bb7dedf51035744bb
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1