Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd158da12bb447a2…

MALICIOUS

PDF

100.7 KB Created: 2021-07-15 20:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d49fcc2e85333e00a6d10905316236ef SHA-1: 7b3e9cfd7674468f05d9ab8bc57b479bc2ba9323 SHA-256: cd158da12bb447a2a98a461a8c93a769abd55752546c452d0b0728c1b783ddaa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and is identified as a link farm, suggesting it is designed to redirect users to compromised websites. The presence of multiple URLs hosted on various domains, some appearing to be compromised WordPress sites, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://oniceh.ru/uplcv?utm_term=lord+of+shadows+cassandra+clare+pdf PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e32eee0994e8fafddb88af48dd7cffda/jirakegodipa.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kavigeketuxivujovavakevid.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/cd4e3639d5733afe02f631a4d2edd677/tobixisa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c8b70cd6a---64146811615.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0csn0vqcj20ncuvfc7n6r8nrc6/5428947760.pdfIn PDF document text
    • https://ebooksweb.net/files/file/safaxebufakabasulegavimor.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pk97ggnvfsq919s9e76ncnusi1/damokazesuvalopoxitub.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c8b352cd3708accdfd6412eda7cffe2d/21222576049.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/870772fca169e34ae883af46789e4b30/ridamu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a199ba1a87b---12030747759.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6014ea0cd1---75359756397.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507080832606780311.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aebe65a9---79644651362.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609317f2afde5---37405679411.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160723dce92b7a---10416630114.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/87918720354.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vunil.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0e2e0189bda3abd97e402b56cbe39c0c/15682239769.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/kokutuwoj.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/kuviwileza.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/sdiug48ql2i8oo4kv9fltgcjsm/nimepov.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7936ea6f---36217223009.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e169c2c8b2---widenolamag.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_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 19976 bytes
SHA-256: 27912b8b1c8d70284172a078cc4a8ccf9a811da3a55a5018860fa722fa95832e
font_01_sfnt_off00013dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC7 10572 bytes
SHA-256: 5092da6540e9a9477ac44128a27ac36e8c1d06062e7bb7923c1bceb847ab4a63
font_02_sfnt_off000155e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E0 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00016b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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