Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e73724fb55a926…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 09:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c107c717186f5ac8654874bd00f3806 SHA-1: ae808d0da31d96ad80bde6090205558a4d458bb7 SHA-256: 59e73724fb55a926b5fde314c561b0c4c509cf25e32d9574ba0975e553f0b892
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or compromised CMS uploads. The document body is unreadable, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ph2020.org/ckfinder/userfiles/files/wisaxuwejof.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/61103771933.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/79db331b6507547549cb18f5f07d5408/zosewepepi.pdfIn PDF document text
    • http://kite-surf.sk/files/begig.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdcf80838---tujutegewesetuf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e385a739b---zukapuxuvesivu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/37055463786.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/julewalavujumofotezovato.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/13160536903.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/tedexezexudorejinilopesur.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612744b251e88---boninuvewavevaxo.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/33628484018.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/24030875246.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/wipepija.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5669acbd0e4d9a6c67d57ec5ad94a4ce/2049205682.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/96746393670.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/35033872109.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d54606be4---40520973115.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5ee678ebcd583b6066893b15ff90e0b/biravelivi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/brgm3vbjsi03rd8sqird0j75rv/5744351161.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4cc288a7bdaa77e49535c0e04b00e071/17209564185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=includegraphics+pdflatex+pngPDF link annotation
    • 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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 18288 bytes
SHA-256: 4955d1e41c8469eef4e66cc9b13729de0d178c8438560deb4863bb00b05afb53
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10932 bytes
SHA-256: abbe22cec0278926bf06246f55477e7a80223a9bc4085369507113189f07fcc8

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