Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cdf4a375c7f184…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 20:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 653db9b58f5a662c9e2e8a9774b9bf02 SHA-1: a5d8f2e4d994766fdad7bcc08fead1d9fb09212e SHA-256: a7cdf4a375c7f184a6fd14f6f52a00ac624c62836cbf1b3e0d220c3b3e99c6c4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this document is designed to act as a link farm, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oncallanatomist.com/ckfinder/userfiles/files/68076250470.pdf In PDF document text
    • http://huonglonghotel.com/uploads/image/files/xikisizolekisaxavina.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/82346913027.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c8e7b06aa820dc10e486b33cd55d5939/73578437611.pdfIn PDF document text
    • https://dm288.com/slicice/file/78863859107.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/44dd1e71a75250231d726f5a984f907d/29793624813.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9284ae90c---rurotuparatetigolokotoxit.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc9186b78---jepelak.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/287978a9040ef4bc2bddf03dc0632c54/paxekogenemivipovegekozu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e473e332---45254546760.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/39192105702.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f9919fe95f6977e018917c49ef809ef1/96896480597.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vlt336l7n0h4er1mgm20v56up2/766149571.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/xanigilokuzos.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/5870314973.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/zofomexijareguluv.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/topujufigexefimowu.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/16605063312.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/80168680855.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2b2a69e3---31349691789.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/94423431785.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12645433361.pdfIn PDF document text
    • http://fkhd.cz/data/img/24395950040.pdfIn PDF document text
    • http://inercial.es/uploads/files/daxipeluvewudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=haskell+well+drillingPDF 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_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10376 bytes
SHA-256: 1ecf57706b748323b777f5473c0f86f2f435eb00ca3ac40f06f5f6d8ddb37cb9
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 18060 bytes
SHA-256: 0c85803925a9ae2ae557299809d38799b22ca3f896e0aae9404c125c05685593

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