Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0371018da658aa2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 10:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd12d13dcd5ff986248c1febc3a65930 SHA-1: 7e8f102f98718cfd8729575d6643b9580627c9fe SHA-256: c0371018da658aa28fd419a926633f55cd06abb5607325ef3f31cf7eb54bae4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of these link farms and the overall structure suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=substitution+mutation+pdf PDF link annotation
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/89034983339.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/bosarufinem.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610bba4780f24---68579984455.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/tazukowejupikonazegusote.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/xevemiwaranenapisegidulen.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/bufogonupegod.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7af7359b4---53528555448.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/16236496783.pdfIn PDF document text
    • https://bem-sa.com/img/file/12716700166.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5485b767a1f8c24bb90019d9787b3e42/15990320694.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/16845362079.pdfIn PDF document text
    • https://wsbtitan.com/images/file/71192733336.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/64246913226.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/kilefutipipagixe.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/igm63ic5qcbkse7e58abq6fld2/jazuk.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/gunewebogatoj.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tejefegirifedezusi.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/682bef1edb6badb213f8138d986ce890/gipebaduv.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/3592979149.pdfIn PDF document text
    • http://8njl.com/userfiles/files/49573008877.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/wuzupija.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/bogoxewe.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_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 10696 bytes
SHA-256: d3b1105eceb5166943c617b00b590d3a37ab84d6f99c93e656e75b851d7045dc
font_01_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16784 bytes
SHA-256: 89d871e1931efcfa15a08e9fadf5b80d710a9b2a9681f5855aa5b7d869729cf0

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