Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cddf7805075dd92…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 17:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a76ea7a91776a0e682f1f08046e9457 SHA-1: f01bf8c40c7ae07fa2a1bbf075ae678048552031 SHA-256: 3cddf7805075dd92c3174018d82004de2ad25dc1a2960b0f76fa1ebc5f21d345
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or to host further malicious content. The presence of external URIs and compromised CMS uploads strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9750f390d---90775730844.pdf In PDF document text
    • http://hublihorse.com/uploads/userfiles/files/72394972492.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cb170c00e27fbd27dde2444c1432db08/37596939247.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/tizafujetixatazi.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/77921961280.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d077915ea1b---wenomebameveb.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/88630949628.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d0142765263b2c2ac4866d9a64c5e3ce/taxefik.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/dikas.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/86027245343.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1c7b8c9b6af8332bb92c9107217c1bb8/78026391400.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4bdec2b3---rafewewunorevapevizu.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/38918642513.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/lowovusopipilelon.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/nakananox.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/girovamere.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/noweju.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/dda9jn0lcirq7rf2pqdibh2ncn/40089665688.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/lutotasowis.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b31b7b244e3---18476541860.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e6ae4d6d---newavoxovasumoju.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/terivi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hri1gf9rb7q2vfdq9tkh5tuc65/30207418955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=era+mesozoica+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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 17396 bytes
SHA-256: 5b946daf8d41b27eeda649026ad8faa0b563732bff05d3b8b200e8f5126039bf
font_02_sfnt_off000115e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 10576 bytes
SHA-256: e7ec5f4a9e52cf8286036704359f8af706e94c9ff3067c0ef9cce56598771baf

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