Malicious PDF — malware analysis report

Static analysis result for SHA-256 158b7d309b60e7fd…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 02:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21664b89725f17a7ef0c64900d449223 SHA-1: 7bcbfcf0f165bc28e4a338a59ec8d3491fb8584b SHA-256: 158b7d309b60e7fd2eed3db160dc2dfdedf8c2315939dedf0294abf4285515b4
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, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. This pattern suggests an attempt to distribute malware or engage in phishing by leveraging a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hasekei.jp/userfiles/file/62020714883.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10ffb20d86835c3c6f7d06bce2089462/gogujow.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/borogarepibimu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fbddccd5ed98c9c8b0c512796440d6f1/43242566603.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607200cfecb0e---beluvufijedetutomomepido.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3213d194b3ddb8c471d705e9e2219688/11478803987.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e14518a6b---bufutigabowotab.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a8260da18faaf2d16622f32f54508922/89458997797.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/84727a755fd866e1c0143f227c436494/75099597095.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f614430f0---xatap.pdf
    • http://susasoft.com/upload/userfiles/files/gilujogiku.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2pfo923h3a8vf587ogl83gpelj/30747037251.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6bc870a6edfe4d65ead784dbc806a13/78334092509.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f6b09a5ec0d501582bb7e390f303f481/71631845339.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fadd149eb---63232749514.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc74317462---gafivusurawoguwuruvawiso.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686b779dd---vosofuwunimaboto.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/re66argkoiakkc4qp0kvtrc5r2/kojilovovef.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/03815614c6d9c5c2677a93d33f9db648/49677407251.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6079308c---75010420630.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8a6sfttbhgb30u8qkq16j0etoa/87343112192.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sodium+sulphate+and+barium+chloride+are+mixed
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e866.bin
5d5615b33d04916ebc978733f1c9217e4b207b8161d06c09e337641d4dda2949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 16964 bytes
font_01_sfnt_off000114b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 16792 bytes
font_02_sfnt_off00012ccd.bin
0b2493c13f60756f1421703be2ca813e3b3831287dca60b0aafadb4c0f2cfede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 11196 bytes

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