Malicious PDF — malware analysis report

Static analysis result for SHA-256 1658b1dc94a56600…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 15:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fec6abe891a88dfe36ebb3f2a850bc5c SHA-1: c1420c3fb524cb652aa86e79b1ff260275407108 SHA-256: 1658b1dc94a56600d653e8de3ede3b733f456bf16fddd7dad02cc36e0499836e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Several heuristics indicate that the PDF contains numerous external URIs, with some pointing to compromised WordPress upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+3+iso PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tbi9ao9912invuiukjeoclsgot/54611916695.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210914020955_1539951634.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/91393232597.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/50356420808.pdfIn PDF document text
    • http://snsi.jp/image/news_file/32963237500.pdfIn PDF document text
    • http://infypos.com/infyposcms/media/lexuju.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/47486957066.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/34d0aab8bc4ac840d2b22f488a53cf60/27377085099.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061455041049.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/6224158305.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_222507.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137236a396bc---rotiwilixeputabag.pdfIn PDF document text
    • http://gibisch.com/files/files/73637058843.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/62738594285.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/89135856641.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109042227147155.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/xavavodosalekakawobur.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/82283916706.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f178fd6d31---gepoxopanibobuzukas.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/rukazumuvawo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/df34cc9443f8463c42f82959cf5e45ff/81059446248.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/67888020910.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61401d6b70b12.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/muzifopaluwol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 18632 bytes
SHA-256: 6ff8378a96228cf0d9403e113a084f408ae5f4770e33fcec083181e849d18355
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 11212 bytes
SHA-256: ed16dd752fe0b563d888e784e89f1971b329ba9c7c2fbb64e8a66d3b28a02d9e

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