Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cda3c02c044a7d…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 12:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 974b6adbb578c7ac1b5f227776f37ba4 SHA-1: c5538a5d2c58cd727774554bb5758754bc8229be SHA-256: 82cda3c02c044a7d35fa2317b94a3e04bd9bdf08f83ffd9a5fafcf433079acf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely phishing or malware distribution attempt.

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 http://caratow.eu/userfiles/file/66160633928.pdf In PDF document text
    • http://cdmatik.com/uploads/file/10926974478.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/78fe5efc90b08127a262e340c337bd8d/vafiv.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/53514672627.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077100c21d13---18955269929.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4420c7f658b65eacaa2c6664d7e5a501/mupedo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pivejab.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737ff8e4b80---vuxixixivofijoserus.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/ruvejatuludevikogake.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/59708287305.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b808978cf---jodop.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jumaximuke.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/pewusuxeno.pdfIn PDF document text
    • http://atya.eu/files/file/86390817470.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d329724e1790baccbb32bae6168d45a1/32228365752.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/viwuniwidexulopolevase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=virtual+villagers+2+ceramicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 17216 bytes
SHA-256: 4fc293f96a5706ece89c065236e726e303e54fbc85df04c2ae3a46721da6fac0
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 10604 bytes
SHA-256: c97ff8b387b7de3b7d1bd8da728bebc472cebd6b7471e44f3f729bb611e1a09f
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16164 bytes
SHA-256: 3ebd486235ab6c407a74d98ab9e1cf09d7661342c8c98090703f1c8ee3396579