Malicious PDF — malware analysis report

Static analysis result for SHA-256 32874a2e3bc0e144…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 14:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eaba9c8b71342d16a8fa740c8466e1cf SHA-1: d6d5bbb24dbe1287fad485b2e8bb29a1eb530d6f SHA-256: 32874a2e3bc0e144d453db457b381fe4ec01286ccef5f6d33728f0c88b7c099a
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 heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df91144018---7787682374.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ds5qd7g6tk9blg0uac91mifemq/54732190261.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/94951879094.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/98812404711.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/25898993343.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/29444905475.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5tm2p4i6ll1rta8oiopiq8djm6/selawogimutemovoxuxafu.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/laxikadafowalivuteja.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/59386214516.pdfIn PDF document text
    • http://venkateshservices.com/uploads/20546944383.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/ratiroboforozuwobawozege.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/82962366462.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818fb06cf6e---revulatovopojamobesalog.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160812eec5a717---guviwinazanab.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16118c67c435b5---80572492929.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qqbroro26kajjv7efaubs2ifr5/56301454809.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/62777233651.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/10745869258.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/17fd95581699011fe8d9cebe741ce04c/69733250820.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/12109203440.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/sipafujexulusivozip.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/wupuwetesebezufijenorik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=philips+avent+manual+breast+pump+price+in+pakistanPDF 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_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10916 bytes
SHA-256: 1de355569eef7619e956f2083dda5f1d4ea4d550d33ef34da2fe1a80d1b75ca0
font_02_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 17628 bytes
SHA-256: 84ba15dcf5fd4792e188f05ecacdfa40dbf9c39d202e2277878775737e4a15fc

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