Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdcfe1954f3c582…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 02:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55e135117f524a94078c9bf3b016932c SHA-1: 7034dac3b96823d2cfeb394cc74dda18ad272881 SHA-256: cbdcfe1954f3c582dcbbfe509a9c35928acfeed86bd05110fdc9d743cedc89e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful content or phishing sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to manipulate search results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sn739nldjhs9kvtefn3pg1fa43/teredusex.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/wataneniremoresovagafeso.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709547916ef---89423922945.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44d16c4db---23021405131.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d294b4e156---nusuzulipikudegapamokenib.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607caae3ea6bf---52890176421.pdfIn PDF document text
    • https://bselink.com/userfiles/file/23332233012.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/fatiginag.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/37561442974.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wekep.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kevipubivuxowarep.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d51a7f1f99f---36453343389.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3df3d421a---visem.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xinifiwilopisolopinetune.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/60648094598.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8f19c5fa3430c83e01f23a8215b23423/27940376671.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/55799505529.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/44572073837.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/1414094831.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/l7j8cnm1bp6n3372e491piahqd/35998616086.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1ad2f742d28d539c4e1714b8023e6441/merinulamos.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/duxezaxabalamotekubilaro.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/12be0b7f77632b978f8d6f7ce1dbd5e3/satebid.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92d3073e7---bawomemijite.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4e519a5b891e78a4a020697b935ce2ab/4516012904.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/43hrc8k5vse1sn2bdb5e7mfrq0/xowanabolimukunasol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+write+an+interview+essay+introductionPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59677447823.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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10672 bytes
SHA-256: 03a2ebec1675200898805dea3eb717f021339eeb3c1c0607d4bea8a19a658985
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 17180 bytes
SHA-256: 068e668eeef8e9d96a62e3b44f4b84c64af239697fb9f0d597a2ca03e63d39c4
font_02_sfnt_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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