Malicious PDF — malware analysis report

Static analysis result for SHA-256 980d8952003c430b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 21:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4812d796d634ba81151c6f55bb55030 SHA-1: 4ce975c948e7a8f2b2e7db59602bf7fce66a2b53 SHA-256: 980d8952003c430ba0fbfeb034cf1a8fccff5646b33290a7f6c10d947de41d78
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 identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.alex-vasilkov.ru/images/wisdom/file/81683429024.pdf In PDF document text
    • http://hrudolf.com/userfiles/7233188963.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/38990962274.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d936ef9f---20451056704.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9df43f1fd891aa486df9804ad26c9176/46516805546.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/80ca596d348f78f673588559a3ef41df/99387206217.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071efd5dec51---63927823163.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/26287829480.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/20ebb35667820a59784a40b5957652e3/33339619323.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/14748944504.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/lajukevekugolejumagomesif.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6c4995e0---93849524569.pdfIn PDF document text
    • http://cke.hk/userfiles/15679245866.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/xojuxosoxegixi.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/74558152160.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/94579023043.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/23295401415.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612db5d39cc66---56812947672.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0c3525375c5080dff8ed0d7fd15606d4/51760015412.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/88654169765.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/99370280442.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/golimafobojuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=shampoo+celamina+zinco+bula+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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 10896 bytes
SHA-256: 7375de8dcadfbf0be8706a593692b820a0a078ea74250eebaa05c6489b39de9a
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 19264 bytes
SHA-256: d36f8373bce58b052e6e2f73d85fc8f57b20e762aeb8771a538cf8fff792f56b
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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