Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b312742acfd314…

MALICIOUS

PDF

85.6 KB Created: 2021-07-17 17:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c47b733f12ae4a41cfe21d757716e64 SHA-1: 492d5ca0ebd4094c9355f102375a35e3025da429 SHA-256: 53b312742acfd31407e7b55c95bb19aee6aebcd36dd390407509304d8ed4f245
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.peretprod.ro/content-images/file/78972063377.pdf
    • http://elijasprojekts.lv/files/file/jofifitenedolulamob.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c5288b61e1ad66525c8ce686e25ead1a/4079201757.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5215235711---mujoroxadakikidirut.pdf
    • https://isosklo.cz/uploads/6153571382.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/3603be4c9847d49c65116c8e2372ecad/23501246408.pdf
    • https://likeevent.it/writable/public/userfiles/file/5855441887.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/90fef0c50e53c8778245212b8496fc6f/32062742963.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de188905b6---gezizuzobefejafajo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c14dea80f---wuboputoperosavof.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607348e2749af---36411991390.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897327bb266---wunavelujed.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded8481680b---10484319734.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071904aadf28---repelowevifufaxitana.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/28c0e12c94c8184d6fd39a8800401370/ziniwugufegaxuxusa.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbb45d2eb---56785009186.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7efb282877a28a22de7aaf2654739a00/teretulaviwakuwul.pdf
    • https://xuantruongtech.com/images/ckeditor/files/dupawumewimixiwifomonigo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609559736a1b6---52995152120.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d62b8c67---jimetoramotuvaka.pdf
    • https://atl-50.com/files/file/jikofobomuv.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0899a771e---vinudurerutemujizaxi.pdf
    • http://www.abcklima.hu//data/editorfile/46894673149.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/7d773d1fbb6689270568b1b9a18aa890/doxojejo.pdf
    • http://flomojapan.com/upload/files/beroximaxonenopuguwajid.pdf
    • https://juhaszautovill.hu/userfiles/file/18954093542.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61427fa3f---vabawijuzum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=electrical+grounding+techniques+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16792 bytes
font_01_sfnt_off0001033c.bin
fbc04abb273f7df021a1cb619b584696dec3152828ad0c7baa0e6b2adc9aa18a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 11128 bytes
font_02_sfnt_off00011c95.bin
4b3c6a2337bf78c4bcec38730d617c0a9ee38a72d63b612fadab9931247209ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 17188 bytes

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