Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fcc9d3c92c6c7e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3782f17ee7ab0be96af834e898034cf SHA-1: 9f496c257c417d053796c6912f0b7ccfbb62024f SHA-256: b3fcc9d3c92c6c7ec269609b2cdf995e1cc1ecc3b0f4c82eddca6ebe7fc95317
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which appear to be compromised or disposable hosting. The embedded URLs, such as 'https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hack+account+link', are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cfbadalona.net/ckdata/files/kinivugulu.pdf In PDF document text
    • https://ratodua.com/contents/files/64338033685.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ccc36e28eb9701689759b79dde2d7ed8/18812826692.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/revezesoxuzopusuwupa.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/zibapo.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/53844730269.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/85371563039.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109150205086367.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c45b3ea2---67686190041.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/37304217426.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614308648434d---xogexuze.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109181457124103.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/47785679792.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kagerokim.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/pivam.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/45902496078.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/76282431910.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff6b93f7b---rakuxigozobadamuba.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/15103940411.pdfIn PDF document text
    • http://waypl.pl/upload/File/fusozividifevujekibema.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/2717398275.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/62796909547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hack+account+linkPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/javima.pdfIn PDF document text
    • 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 19616 bytes
SHA-256: b5bbafdb6a29b9d869d5ea84954c17967d72bb942f550bdcf03d448d2ae6167e
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10008 bytes
SHA-256: 4307d12663cdd047f3640fab12afae29c4f10819a450ba6b70e86c1b561822a9