Malicious PDF — malware analysis report

Static analysis result for SHA-256 19df7b9154a39605…

MALICIOUS

PDF

79.2 KB Created: 2021-07-31 02:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c76201eb83f601c6b46c26617759e1d0 SHA-1: 6091b528d24a522bc08817d9178c11b347438961 SHA-256: 19df7b9154a396058bfefdaa1cf0fd490903e826d10ee540321a7d9df1af63cc
172 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of urgency and download button lures further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=munna+bhai+mbbs+full+movie+watch+online+free+with+english+subtitles PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5bbca6d51fde4d4b901d2c13ce4d7535/dimizadagekot.pdfIn PDF document text
    • https://curvy.tw/upload/files/1759821967.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f255391343---nenav.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/kevir.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zozawamusafunomox.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/59038412687.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/96103525291.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/bezatux.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9235a19c46---wutinobaxefutevoxuze.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/41144340285.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/41917491818.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7f6087dd---mukoluz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a46e8105d---89238220908.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/bufurugupasemol.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/85ad9ce16f4302319b2b9127504b10c9/tufemuzagolulaxi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/oq7bkjne98ags86qu39gkrvig0/73186031514.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/63c09320aa6320474069d8216f81e733/58761252889.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4d59ac1e1f302214a50a97ce200102cc/boruwunezuner.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbdcd9c36---bixififanijodupenopisez.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad705a4e21b---lorabekadijowapewe.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/suwonepalexetaj.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3d7a0576---28292539094.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210731_063027.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b5bb8807b---36425715405.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_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 11168 bytes
SHA-256: d0d4eb0b18986230e12260478865a2d5f5bc28922f499f07a0a8b5aa2ec1fc71
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 16952 bytes
SHA-256: 14c6fd66bbb0580002ff747010ac3b39f1087d097ef8cba1b93c3c563666ea3d
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1