Malicious PDF — malware analysis report

Static analysis result for SHA-256 876d758acb9b6f5e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 01:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f88df80c57159189aaa08783906fda5 SHA-1: 0fc9a7bcdd4a20fd81896dfe1d796b18057d335f SHA-256: 876d758acb9b6f5e96a390cbd78f11a7d01fad5aa5336eafbc4b5b1bc785f2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, with the primary function being to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=emulatore+android+windows+8 PDF link annotation
    • http://flynewsletter.com/uploads/file/gipew.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30353168912.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906160158.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16145bac44febe---60458851917.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/sevefadezu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021092105044773499.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/48800615417.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/fatur.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/puvififovozeduremer.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/76c9c9ab2f358161ce87cb446ac5dee9/domukofevefuvinitovogif.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/36758278026.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kinerugewitisikojafupu.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96772519767.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/6994403657.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/95527533715.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/746238685613a0471ad3b4.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210906_B8D2AB07E5384362.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa8d51579---45879648219.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/89185601802.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433226a2934---bojerulidud.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/pilobavilov.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/06f72ed021a68e5446c8d1dd6f995dd1/pumowetimowizotefat.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/lebetutotim.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_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 10784 bytes
SHA-256: f2109fecfc5b1f2dc979b3e50c2edad6a707cd5f2d253b5b41f3f82dda1fb476
font_02_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 16224 bytes
SHA-256: 3f21b7ff5090a65779f846201126e7688b495f2c114d86f156aa50fe9ad391ff

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