Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ef301e2cb4b7cb…

MALICIOUS

PDF

80.5 KB Created: 2021-07-03 20:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd51b3ad1e4a8e3c4af7a3ff00aa2400 SHA-1: ac34377e6b3e5e6f2eea882af8b8bc165e6671ae SHA-256: d0ef301e2cb4b7cb9dc01fcbd53c50e649b5270a6fa869a8a15bd4e4faaf3542
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links are likely intended to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fe192e69d339e7fe552a032c95098af3/35574197084.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/30bb53f9861468ce87cd65d162da0087/milodaxal.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/baf4f43a2027fccbc5f5f94bce1bf201/ditunojipamuvobo.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b2a0793adb4.pdfIn PDF document text
    • http://hydrem.ru/images/file/85354074829.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6f418c3dd5c2377dd6342699e62253da/wotulokelolebaninizit.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/zaxexoragisabinosu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/86890749656.pdfIn PDF document text
    • https://yuktogel.com/contents//files/nuzivuwosugebafa.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/acd5f62db74b75610d0b777c5b0cd3b5/fobogedapaxawaludutuvuv.pdfIn PDF document text
    • https://mmszke.hu/files/file/95533042681.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddee9b5cb22---78893434400.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/77382451359.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca5b9f755---mefeluwo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ji5itr01839k8pqq6qtjeu0po2/julozegefu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/kowikipekumufamuw.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/18238560621.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a5ec0678edecbc1f485da674b31cb4f3/81799541783.pdfIn PDF document text
    • http://slsnn.ru/content/files/desukizotovinokilata.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a82ec4cd---6086768191.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080d61bc63e7---robomananolali.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3e8c9e1cbe163c30f678aafb837c588a/gerozojuxu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dezafawipemejene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bissell+1672+manualPDF 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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16972 bytes
SHA-256: d885b84101aaf00bb42ba8687b5b9e2607314e68de8405d60cb5a8fce9ece59f
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 10492 bytes
SHA-256: 35e90188ecc755cb585e71dab7fe8119c66274a24cc839fe66023633215b375a

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