Malicious PDF — malware analysis report

Static analysis result for SHA-256 551b8c5a0002292e…

MALICIOUS

PDF

93.2 KB Created: 2021-10-07 03:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e26f8a97e77d514c169358e962b1b7df SHA-1: dd1b7304a08fc4cb3c7dfcecc619a7e014f5922b SHA-256: 551b8c5a0002292ec8102f95dfb963ffb92c666c8d9f3d742117090d45e55968
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document body is heavily obfuscated, but the overall structure points to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=behavioral+job+interview+questions+and+answers PDF link annotation
    • https://worldtradezone.com/userfiles/file/lozidona.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/wisatisiwunuvugovera.pdfIn PDF document text
    • http://labsshop.com/d/files/51586208454.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/76461243844.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/wejupajijulabutudilim.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/sepulemolana.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/2017505082.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b98435ab06a974f61b9548d3e6bb84f4/17627860765.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/90079486868.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/kotamigewexabetadaseka.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/42780066709.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/lefigapaxabikutotazib.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/sibog.pdfIn PDF document text
    • http://fitviewer.biz/files/file/sulerikefepodajig.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dlrar6qgs8vkpps4ejgil55302/wokutebulilu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wewejevibovagivebi.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/zewudizanakewexak.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/maworikunuf.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/rupoxajapajikifusozezok.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147e4d0e4d58---gusikunavumeb.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/mofite.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/padamumijezed.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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 11068 bytes
SHA-256: a2b5368ce5afb1860f802c9c86cc2c5f8c12686989bea40d2fa7cf9a23b23a36
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 20036 bytes
SHA-256: 24a77c226f13498d8a5f9b7efcc9be3596ba50c5707d566493b524ec5262b0a0

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