Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2f8984393a909d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 09:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9940f49791950c90f4de0127277215d1 SHA-1: bfb3d8f042cf1d6d483fa4855f317ed9f8d00da9 SHA-256: 2d2f8984393a909d95b7b997ff0200c9e9abbaf375eecc15d2e69b997d399e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522012d394d---niwefume.pdf In PDF document text
    • http://slotkuda.com/contents/files/36411231660.pdfIn PDF document text
    • http://www.andreapondika.cz/file/76148157903.pdfIn PDF document text
    • https://maisonforville.be/documents/file/8653506997.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f83f18eb417f8a34c8066eeb74aeb378/bobovuza.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wuzezeniwufadutojodaxo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/68695497847.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/buvolepurox.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/sinozasuwekofowo.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/fisidenomuwukosezevizuru.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/21482675858.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/27096003234.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/40921842221.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/44959077850.pdfIn PDF document text
    • https://servauto.fr/img/user/file/62410818426.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/10607647921.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109152129226199.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ai4qjhhpld4sc78rg8lrt5avs3/53231262377.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/gogex.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dutinojerose.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/22637115033.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909151806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+main+rules+of+basketballPDF 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_off0000b1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E7 10776 bytes
SHA-256: f9a0f5480b6732552391f4d416980046b9475a7322fda441f151d62cc4b9994e
font_01_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 16800 bytes
SHA-256: 6b5233a30459de964a0a35c1b56c1b4c18cc62d1b8af55cb13264c2c31cc75bb
font_02_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1