Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bba9e202b3fb25…

MALICIOUS

PDF

96.1 KB Created: 2021-09-01 05:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7535bf5bae90503a235fa1343391ae63 SHA-1: f769441d75b5bfe0237bd6e2e75d8e5cc935c6c6 SHA-256: b1bba9e202b3fb250ce315f02e7dce4bd3def311f189ee08428ee39838234816
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://terrebleue.org/userfiles/file/fenowesofuzuwigolufa.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/96117917031.pdf
    • https://gotoko.com/cmsv2/upload/files/pagede.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed9ebdd018e569ce82f4e95f9e4374bf/61649620550.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4481deab6---towefalo.pdf
    • http://chromowane.com/userfiles/file/lukoxaravezas.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/932f6b5cfe08784289c7487d96a2809e/19866002515.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/17893833516f2d44abd90c4f5cdcc2a0/16365987482.pdf
    • http://pcwenhua.com/uploadimg/file/1628068515554894325.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d14784b---94369798911.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6167f352aae9c94608e7b3ba04e67ca9/rurirufivakutijuzaxoliva.pdf
    • https://dolaodong.com/userfiles/file/zozula.pdf
    • https://armandofalconi.net/userfiles/file/85545427980.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e9a6d8f7a55f883c4276cc73ebe8bb28/tibegu.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/669787eb842f4b41d28354b2759922f3/29303269090.pdf
    • http://rajskiewakacje.pl/userfiles/file/rozenopotugukelagoradi.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/13df631daf7293d27a459c857cb577f2/77737234868.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e12dd00ee7b5adf17ea3fa7c76517c16/14172180516.pdf
    • https://perfecthospital.net/FCKeditor/file/kuzawinepedavedufurewex.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/88d4ef8bf23628da5cb7c5f9ee2584da/29991449645.pdf
    • https://evergreencans.com/userfiles/file/bigovosusexa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hallucinations+and+sleep+paralysis
    • 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_off0000f8fd.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16092 bytes
font_01_sfnt_off00010e3e.bin
8fa7c3902b5049633496eab76d7697e75ccc9221d182443e6e19251a389571a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 19824 bytes
font_02_sfnt_off000140ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 16792 bytes
font_03_sfnt_off00015905.bin
bebd74bfbd64187e33ab4872061993d26449518ee847375c5fe34bb857533a79
pdf-font-stream PDF embedded font (sfnt) at offset 0x15905 10712 bytes