Malicious PDF — malware analysis report

Static analysis result for SHA-256 606c5e30c692107c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 05:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 832064931c51f2af2d57ea7f39ddcbec SHA-1: 4f41faf93c0739be9bdad5954cc74d81c61b6f9f SHA-256: 606c5e30c692107c11c2967d1cc462a9c64899019eb248371f627520e36f683c
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware via a deceptive download button or link. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=hp+jail+warder+question+paper+2017+pdf PDF link annotation
    • https://ooo-kenk.ru/userfiles/file/jutab.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/87843527784.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5bf4d5208f6893ce8d4f5b37d5294e85/kitifodebefi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099219d76888---dalododaxeruvuropajufaxuz.pdfIn PDF document text
    • http://datcat.vn/2018/file/sovepukafawakuxijop.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/zumazikes.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/873ec37519bc6f45dd0afaf1308ba62d/wosibal.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/tufadubojumawatitazep.pdfIn PDF document text
    • http://com123.vn/uploads/file/20060896930.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/79836509323.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ec028c7d6a09467a3d3a03b276e40212/93658692970.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4819762133a0735500233bd587afe7d8/mikazazuxav.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/84057e42faaaf0a1797d318103923968/86283753265.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/61497960413.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/49274480814.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vatudovafogasuraxoxekas.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/kisudizidofuz.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/nezova.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/59499592382.pdfIn PDF document text
    • https://ms1oke.com/contents/files/daxoxogubuseda.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b53554668---81085784162.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/mobeweniki.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/desulurulov.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8adf008a---gebujuzusomexuvadituka.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/6783307780.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/318a03ba831d2d9735fd4ab746a4d512/43450087141.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 11288 bytes
SHA-256: a31d32dcbd17c8001685260b1b124c43a9ec35b035a81ff03f926e1d9db9d088
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 17784 bytes
SHA-256: 3fa9db7e7fc4add28045a578929d4815e75c0695798a4cf633f1876a551b32e6

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