Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efdb5d1f339de36…

MALICIOUS

PDF

85.1 KB Created: 2021-08-15 02:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6a33cb1fb16fc4381e4cf61f38660ec SHA-1: b201ebcfbadd17a802722e04317e2cb9a7df0e92 SHA-256: 4efdb5d1f339de36873b068b2bc6c5e8f5f8c7a18697f4a5d7a39b7e2dddf34d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=bosquejos+biblicos+para+predicar+en+a%C3%B1o+nuevo PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d07daba1e---23744943854.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160727f0e219e8---289557549.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/depopab.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xewejimagis.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/xagixadutad.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/02bf23102dc023cc9827d9ef8708c309/rifoni.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/febokagazirosi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/25742452300.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/tutinofadonib.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcae5e64aa3---60268785479.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/58885276904.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/89221608276.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dilavi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/67979172094.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c441d2f33b---14356239332.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae101e3b46---lubenoluxafixorolok.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/75910903401.pdfIn PDF document text
    • http://iphysiology.ru/upload/71915876002.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/70285380148.pdfIn PDF document text
    • https://pepsima.biz/files/file/66917754019.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f550d553b3d9771be300f582b23edfb1/5792219372.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/26502769129.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609553acd1a81---zonutakubimifekeneti.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090960e73dba---89945502605.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8870eb953365b9654520dcbacecb912f/vimuluxelaxidezegavutiwon.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_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 11252 bytes
SHA-256: 3a2a9699ec8f4123ec58681b9a2f2bcb30becd85de325600e90e5508868eb80d
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 18576 bytes
SHA-256: e5e70f8a1149cb4866eba2a1ee421987ab10dfb6bd117f5e7fc82d469e319e68

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