Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83531f3476c8917…

MALICIOUS

PDF

235.7 KB Created: 2021-06-26 14:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f076bd780ea4836f9ecf7f6e0785ff7 SHA-1: 505ada49fe9a43fea4685181f7e95106bb4444d8 SHA-256: b83531f3476c8917318c90c3bfd68d6258e87bf9b6ba45d24ae87012dfab0d37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to potentially harmful content or phishing sites. The presence of PDF-specific heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=100+questions+and+answers+about+schizophrenia
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160862eb308079---10432710661.pdf
    • http://simonide.org/userfiles/file/kazanupeke.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v0njk8p544inept2cj3stcnmh2/mixokogipijavuxanezovifug.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cf538112e---lonabi.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/19165ce1c03a75a7ecaf0d03935801c0/78354705390.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacd65d0c9---bopivolibilarutog.pdf
    • https://clubelsendero.com/img_pag/file/67520179948.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7fe56ede471f0489e32b6a0ae7234e8c/89792961711.pdf
    • https://smilepaper.tw/archive/upload/files/nunateb.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v4g4b3brsu7tlqpjm62dua6rmb/gilimiw.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13944b01f3cd270f504a4f200b4a30dc/mafijoti.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210527155653.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/867f1225682efe283a830b01f6be36c1/40303139139.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/duzavimokokijiroxuvi.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d9119c5b---11988743735.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vh4o00ck1skqn9rlu95i5o0ie7/99765776597.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4e8aeb4c33b2286571ecb1e9cdc5f55d/barume.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4901ce50---disurexejakoxevijulap.pdf
    • http://arunimaflavours.com/userfiles/file/92766972929.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/610ea941e4627bb69d49f1c15b3dbb55/vamijobapuposamawip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00032089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32089 16792 bytes
font_01_sfnt_off00033896.bin
faf91d634f9146b5a70c72c688a153bc4e4f084fd3f8f64f362101711534890f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33896 3684 bytes
font_02_sfnt_off000346c6.bin
ce8fd9fcfde52e7244049e55e93da262d9b5dfc9721cc786807634082781a7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x346C6 25536 bytes
font_03_sfnt_off0003864c.bin
f142e2720b414249c05bd692acfb261cb4c3c4116ed48af92f3963357cdfb56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3864C 11172 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.