Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5477dc3dbf933b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 07:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9b9b67921c7346bf8ef280f7f3a3aa6 SHA-1: 5aa93b421937b10d9b87febb313ba3d4d212ec33 SHA-256: bf5477dc3dbf933bafe58c7f3b013a84771f1218325eaa7d4d8faba9d04cf2d2
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malware or lead users to phishing sites. The 'SE_INVOICE_LURE' heuristic further indicates a potential pretext for tricking users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rana-international.com/userfiles/files/firadanitutowanenenujopo.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160721ef10eb41---80522191248.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2545c56d23650a249a46323164c9be80/39629022528.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/22156031377.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/48320559115.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/72862543249.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/kuvunesetir.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/60640338020.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/70051704882.pdfIn PDF document text
    • http://sns.hu/_user/file/kevumatutugosavesajuw.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zujalalo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbade210a3---69025725627.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefb27e7d---vofajosanizigibosuva.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cc269f9d5e36ee14274bfd1f304cbbcd/fuwejepafow.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/87108707313.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8265eca2820cedbbb07dab32d549ea2e/kajovomiw.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bb87a5f138f105d570ee495ce3946380/46309805877.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/tukizelofod.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/59493608063.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/wixanuzemovewuwegot.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3c0501a6db16bb9ac9e4d094aa3c484d/tidurajuben.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/95321828192.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/75308942593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=definition+of+cost+accounting+by+different+authors+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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 17332 bytes
SHA-256: bbfd57b3379413410894f508a3c63a74138c03a0378227fbc908c9d40ed62fe0
font_01_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 11208 bytes
SHA-256: 80fc5983a589dd703cf6136396119ee60fbbd5099f4b6543848e101d886aa40d
font_02_sfnt_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1