Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cfc6f8009c3531…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 02:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0e6c31c217d4f25351a421a42ff10a6 SHA-1: b2cc38a9ae32b2af472373580c7f81b88832fac9 SHA-256: 65cfc6f8009c3531d201d044e8ed6ca91024cd084a9a5a34f3251f27490b1106
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a lure to direct users to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0abc42e7b9c3a1b9d4c895e36b4c0ebf/kobosexorodewa.pdf In PDF document text
    • http://bfttacg.marketsearching.com/upload/files/bozagukiron.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/61021817144.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4c1474908b826ed859a4d3c489d5fb5d/pitekarip.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/wunufuko.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/72740977993.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/97038287613.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/96998357176.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/duzewaje.pdfIn PDF document text
    • https://limsurdua.com/contents//files/84211648918.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/fipigazefokox.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630264015.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/98332cd75dfe03f9268ba6d287ca551f/fiviriruvepaviludunenagi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4c72b2d2f5e8aab6c5cf58be2314b388/piwutamiwexuzujumitagov.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/220fdfbb6f09e008063fe4abb271a16a/sujipijesabepavikale.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/18311941037.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa04d433e---wibiluwoju.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/28386704778.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fde565f93---1468418511.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d19d3068b---jebojazev.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0510a5fa82b5d740a0080a93207ceb67/78420059790.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609632f576fe7---lixolew.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/75292148207.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/49688418603.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pt5fc4rceutd562797pkpmhjk8/zixabiwuvufetebika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=proving+angle+relationships+worksheet+answersPDF 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_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 15824 bytes
SHA-256: edbd8293e92f7f259d7d5deae41cd6c0ffdc681777d89e8fb39062f61ac5c0a2
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 10776 bytes
SHA-256: b64e051ab9070f2ffb64fb175ca4eb45af074a7e6a5e39da0ac846f166204514

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