Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4bbc77cafa0f9a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 01:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8da4b767dc218d3812c2dc39c2354f3f SHA-1: caf0a646d3e7c0b28f5acdad343136192fbc0a61 SHA-256: 5f4bbc77cafa0f9a296e4e4c4a2ae0f93a3704e0cf736ef71881ee6ec57f776b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs, particularly those related to 'download' and hosted on compromised sites, strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.s-prom.si/fileupload/file/xomaserevanipefazakifepu.pdf In PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/pidakejizujoxexe.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/8451285389.pdfIn PDF document text
    • http://www.polni.si/Images/files/69815562106.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210922153602.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/67319902086.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/pizubef.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/27945690879.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109191252425885.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/gabojumejajez.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a29062078---wapejuxepirupuvodo.pdfIn PDF document text
    • http://kmsenior.org/file/files/fivuxubanigetamasulizejob.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480f9654d29---midapupujod.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/tosixovokol.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/kobitazibamegur.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/nozesuzinenotibudowanisi.pdfIn PDF document text
    • http://geodez.com/pliki/file/2429761797.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15469593894.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/5233026298.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/145bd225cce601cdea1c4807444d2860/tirikadubojesolujodosetu.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/vafaxolavevawezofifaxud.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/patefezivevaz.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/zibobaxalijeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+dream+league+2019+filesPDF 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_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 17412 bytes
SHA-256: 261b7864a1bae152c4f4bdd11f20ddde8edbfa3e6bbf350515a0e3687dc561a5
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 11248 bytes
SHA-256: 52a3505e6370a559209138bacf2d58460fbc2ef390ac645b977f814b4578ef76