Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b938543a4f6f10c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 07:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 50861a5ac5aa7bc64252b20919916f86 SHA-1: fe62682d97a5e8ceddd7d5a614ecd7daa03856f7 SHA-256: 2b938543a4f6f10c6a8b9a7f21075a58e936b9c2f4d2d4510d07fcb31c065897
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms or compromised upload storage. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gloteckr.com/upload/editor/file/12536801721.pdf In PDF document text
    • http://dataprint.ie/uploads/file/21224466550.pdfIn PDF document text
    • http://chinazzjx.com/d/files/gagife.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/36204808799.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/9902615019.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146810f4b994---60663467063.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/nufov.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/40623064073.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/logeka.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146a95d49529---bopotupepoxogitabol.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/72581869963.pdfIn PDF document text
    • http://chinazzjx.com/d/files/76241932788.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/lugunexesujawaza.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/velibuzowujomitemas.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/88258759502.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/24827039382.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/fanapitewofik.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97e766a99---57155837124.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/umunigbttorasg7u852h99pev2/dewuxilavukura.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/p3kp0ijt1u825b3bq6d4lclur0/junimobiva.pdfIn PDF document text
    • http://oilspecchem.com/files/2349079610.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/dewogidibifepujazigatas.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/bitidatuboxesupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+install+self+signed+certificatePDF 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_off0000c078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 17072 bytes
SHA-256: 6b9b62857609e8d163d8db48782c7c27d2c236bd9bf2b221ee767e481b62374e
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10632 bytes
SHA-256: 73fb4eb9bddcdfaab4db960ec4c7b9500c40988446e45e861a19f419e214d4fd
font_02_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1