Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e7de0a0e2c5a9d…

MALICIOUS

PDF

96.0 KB Created: 2021-08-21 21:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9a01ad9122dd764f5a70800caf52872 SHA-1: 0c8fc3d9ba7d5be2d5d26d07dad58e2608e1c7bb SHA-256: 31e7de0a0e2c5a9d176e6a6d2da7805c5acf0c1547ecff108e6a91aa8be23fd7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, particularly those on potentially compromised platforms, indicates an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://synerhu.ru/uplcv?utm_term=how+to+get+blue+coins+in+brawlhalla PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vrfklp68mj5g6qfhvu9e176s84/xomigakazuwodasarozudim.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d328b5c0c50---56623714110.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/0uvik270ig3csogga5nvnrks15/94455595117.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e743353fcfca1316bb82df2e76df3d1c/7008782324.pdfIn PDF document text
    • http://sns.hu/_user/file/93862159221.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/zojadebazudonoj.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210729150554.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3a577480---niluvagixezu.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/podenagepubekev.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/32944811998.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/57840026821.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210810_174923.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/70050248299.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gutukimizupugofakefeva.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/27230832045.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/79930631388.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2aa9566a2---22406349349.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/34164282752.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/dojisivubafefew.pdfIn PDF document text
    • http://projectcom6wrk.net/ckfinder/images/files/58873698322.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210720010224_2104121150.pdfIn PDF document text
    • http://a-pluset.com/userfiles/penijosojuw.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4e2omveikqh7kr872ss3sel467/towolemud.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/86556492727.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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 15576 bytes
SHA-256: d81ae317fde744ed7048c6b8bcd445240718063992c14cece45886c2a2f01c89
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 17712 bytes
SHA-256: 93c07cd4a416af5c5bef76742e09ddea45fe17b63235468ab7779ad0f84f8f24
font_03_sfnt_off00015909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15909 10828 bytes
SHA-256: d368f554638b52ede2e810046e6a715360c05aedc93bde1a37770c0a0a85895c

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