Malicious PDF — malware analysis report

Static analysis result for SHA-256 2662be1ef10a635f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 03:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c1b77f837adac91be68f21fe9a258d4 SHA-1: ac7d02c0992af79d8c719c50d6d88a30ba551516 SHA-256: 2662be1ef10a635f473f943c02542f894d2f10b71eb6472123e3bff41ba89b77
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm hosted on compromised WordPress sites. The embedded URLs point to PDF files within plugin upload directories, suggesting a technique to disguise malicious links. The primary purpose appears to be redirecting users to potentially harmful content, aligning with phishing or malware distribution tactics.

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/umbvlm986bdevj8tjhmdpcth9a/27680561869.pdf In PDF document text
    • http://herbwaterthailand.com/userfiles/files/zizububatukureledub.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d34cd06c6097be1e2c7b978a142c0580/57310674754.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlbc1ma060dspm74kpcdk7ji71/35613136197.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b463238de---52132894681.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/92274190432.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dowibafutepibumezusa.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/loronanuwuwig.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/wigika.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xogaginojexanepew.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/68d2bec8b9858d903b7f251a6fc86480/10919093817.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/49203253934.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0eed9a71---41130461364.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/niselagumepul.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109191646127061.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06dbcecc2---21318864253.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/52174122665.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/98115342366.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/53127502238.pdfIn PDF document text
    • https://wsbtitan.com/images/file/96437483106.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/92461516421.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/xofegajavebazoda.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/pomejuwibeneperix.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/57071790173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=2nd+longest+river+in+ukPDF 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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 17808 bytes
SHA-256: 59e9eadd1baf568beebd3af363d4dfc48e67439bf6d52644bfcbc1d48e9fbdde
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 10544 bytes
SHA-256: fc50ef836a5d462f84c42b37dde4c57ffaeb92db8bfe1707dee03f482fdf59dc
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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