Malicious PDF — malware analysis report

Static analysis result for SHA-256 207238c45850f4ad…

MALICIOUS

PDF

99.6 KB Created: 2021-08-03 03:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c789de19fbd8803de2fad1e466fb7aa6 SHA-1: a31ba7b0716b8396c18f95d8a10d5df04a96a660 SHA-256: 207238c45850f4ada9610a0ddbd3d9f3a611762fad985a898f90bee671130c57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9629

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://medvor.ru/uplcv?utm_term=sam%27s+spiral+cut+ham+cooking+instructions PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/54acjslgqpb2e4t9hodhuujvi6/86863644397.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/59410869529.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/15888665722.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3185974fe---wukelajakekiwigigode.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d32df53e1b9---85080903466.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4a4a15f7af15b03af747e25f2323c92/tunijowagipez.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/98488649117.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ee558791e06c4904e710ee97080b1440/pubulefozatefivezokulodi.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/62527053317.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/2409218180.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9ri2d0qsph3pr4qo5p9kn6uldv/82886486194.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2160ed7a---sajufetotomuvuv.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/630826e17bd3a01a940ab2cff099aef3/puvudojimivogedatawe.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160746c8457623---fitufofuxudapusul.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf35b2b9d3---jawuragirejofipuguwuki.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/jijumukekozadefamezuvot.pdfIn PDF document text
    • http://flexicourse.cz/res/file/83158319019.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f539591f2836bf3c955b102e82459986/rebanivatagonasabim.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210730110934.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/betigevagojoro.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084cedfe906f---povikinoxen.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/39142d3db88b9134a1d28088d317ea69/rusokije.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/zenelokunaterovupowide.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/novebo.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/betoferemozazobiluruwax.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b258e8f278---59326118674.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10988 bytes
SHA-256: 9c8011d1986b2a6ce1689a5a8d646a3736dc101618cdfd6b6fdb442a3d8e7d8e
font_01_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 18216 bytes
SHA-256: 6e53b7b117334edb75b792f19d7b23f721d1373c7fa680ad3815349d3d680827
font_03_sfnt_off0001668c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668C 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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