Malicious PDF — malware analysis report

Static analysis result for SHA-256 3110f43aced3cba1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 12:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf11a5003cf2186fd3605b8a55a1475f SHA-1: a7fdc99cc21fd0879b4c59defaa1e2a7a0db6f0d SHA-256: 3110f43aced3cba16a01381d18ad43572ffc3163bd4728cc8a06a0cac17a4e7e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs and link farm structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=redmi+9+prime+miui+12+release+date PDF link annotation
    • http://sacmacbook.net/userfiles/file/xexagoginad.pdfIn PDF document text
    • http://foodchemsino.com/d/files/38084149595.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/12523665212.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/bovexonatenudinami.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/4415452162.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/83040390170.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/wewevekitu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepopadimorozewogobudoro.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/mowexunakubokijorosite.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/duvevubu.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/zebebiwabi.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/pulilefufeta.pdfIn PDF document text
    • http://www.centralperdana.com/file/nugepepulebuzamisiwevepu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3c0ec8c3---rifiritemoluwiwizozelejut.pdfIn PDF document text
    • https://huanghecables.com/d/files/lojoveveloleva.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/198fe59a92a796cb11ca0a2202254bd8/vepukonafaxubediduxute.pdfIn PDF document text
    • http://iscelenie.info/files/file/474587658.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2b3c6c0db08dfb78e99216eca5ac8032/dulopanizuxiwapakubatat.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f561a913f5757dfbd940ac225ba6b934/dedigodedidekosu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/jowuwevuxexu.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/28783011446.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/211bff8ead75e239396ddc9493bd9a69/84624562566.pdfIn PDF document text
    • http://360global.ca/userfiles/file/70719358757.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7157c10e---dijawogejami.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 10812 bytes
SHA-256: 5ff506c9599fb0012c7dcfc84244baf6d3b589d9c7be241a40e0a13f0b2f82d8
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 17108 bytes
SHA-256: db4ed66c2a3f0ade84478c3b130963620459a497ac179c06728e6444971829bf

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