Malicious PDF — malware analysis report

Static analysis result for SHA-256 d833ecd2e26790cc…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 01:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d29522e18d1c1371316ec80e1a86068 SHA-1: 1779c2c362955e7dfd9e38d8b814f0d992e594a9 SHA-256: d833ecd2e26790cc6f593b4d57ed2ae1d9fa52bd183afda6d176dd4055b1bf5a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on potentially compromised CMS upload storage and disposable hosting reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://technoculture.cz/admin/upload/file/karitonalaxasujulew.pdf In PDF document text
    • http://rfamilylucas.com/clients/73238/File/69864109408.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/73879207805.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rabojolifewoxifeko.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/90652199872.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-7/20210807221103543541.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bb98b311---85205012569.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/57145029326.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/379ae7de5ad73b2e35583b958e89c6b9/muripijitukidud.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749b80b199d---kojuzeraputisur.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/63047691981.pdfIn PDF document text
    • http://xycrusher.com/d/files/32012478006.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e70424c8d60c5363f6e45155875bbb04/47102960637.pdfIn PDF document text
    • https://micsys.in/userfiles/file/batejudukunok.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vigoliluwapimevarel.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/39044672433.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/milagujesaweluvulaw.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/paguduzenitu.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/xabibusafiperufu.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/63495437598.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/sogakopetoxalezinuzo.pdfIn PDF document text
    • http://webbuilders.com/files/file/92925020041.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/zumufabexezuvarex.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f799ff8e6e1---88442047574.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/olj0rd5vlco3297mp7m79ncf2g/wirivenexuwijera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=variance+of+discrete+random+variable+pdfPDF 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_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 19476 bytes
SHA-256: c91bb27098ade67e634288221a790769087051ae911f7d4d36ca879138cb00e3
font_01_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 10956 bytes
SHA-256: bbd9c34c49ffb46d24a882dd0d9bd8e5a09c29379178dce2c87e3543425a0364

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