Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4709fdc94e5628a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 16:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25ca6c313703801069a7b1e4d4336db1 SHA-1: 4dbc0c098c0c0e10c4c6401c4dadaabd357f2246 SHA-256: b4709fdc94e5628ab497b4bd8150fa0e2f11a0ab5906f4733a00ebfa0c92bd93
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search results or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://kaptenhoki.com/contents/files/miwifaxezinanapiwogesof.pdf In PDF document text
    • http://btsoft.vn/uploads/files/26209409170.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/32560562395.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613feebe120fb---65233153775.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/64885608690.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5b110e39---67996367084.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/29347387387.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/43159324760.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/zozegenibuxofokom.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xibobaneme.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334328f0ee1---giwotumisova.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/81612306974.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80db2adf3---xipazemidilesafevigoxopow.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/16274717924.pdfIn PDF document text
    • https://airxps.com/userfiles/files/lejobexod.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/tababudugajododibesu.pdfIn PDF document text
    • http://rcot.by/pics/files/3442119115.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad92c06be---wepologuwunima.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/wulinonidubeme.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/12285167579.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pibuxisidakejoruwazizeg.pdfIn PDF document text
    • http://apsons.eu/files/file/61551753045.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kojilakanidoniwebesuxu.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/tozefekigitebum.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/nezunebivunozazobubel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=getjar+app+store+for+android+downloadPDF 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_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 10744 bytes
SHA-256: d59d36b6bb855df3c91237b805d71a16cb7c3c7eac1154159c3ea946cbeda41c
font_01_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 17532 bytes
SHA-256: ec407da5cd22138803aeed5b6c0df1d172ca0a04ec38dbc7c7a0394559da38ba

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