Malicious PDF — malware analysis report

Static analysis result for SHA-256 993d1e49d56b389f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 14:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5814cc32eb589761f76bba7345b83e7e SHA-1: 9387dfab45941b1998763305b66bf9d13f6a30da SHA-256: 993d1e49d56b389f7f5e98d17155ca5af97e987a1b270c98ab4d442991a2314a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier as malicious and also detected by ClamAV as a phishing trojan. The document contains a link farm pointing to multiple compromised websites, likely intended to obscure the true destination. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the PDF structure and link farm suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tareeapartment.com/user_img/files/88819033704.pdf In PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/xagig.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/73737623265.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161465f5a5f5f1---94883660050.pdfIn PDF document text
    • http://motty-etai-sharon.com/files/files/zosilut.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gumidosukovekolejagepe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16143af86abf82---kaxutavulux.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613562b899a61---kijavut.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/zatone.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/52423900093.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/rerav.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/lurib.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/84000569244.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/wawelipesijogidizukax.pdfIn PDF document text
    • https://lecachet.fr/docs/files/suletobigokokuvakimaz.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/bedodojasedenaferulejomil.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/ruxavoperebipilazorivajex.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/65969023413.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/mowutexaweropirafi.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/vawanowel.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210918083749.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zafefarabozawefanubin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=activar+sincronizacion+correo+electronico+androidPDF 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 19520 bytes
SHA-256: a9cd26d6c89e6ef3207d3000958c532796f1894e8ad308f2cbb28ea867e528aa
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10472 bytes
SHA-256: f2cfaf2f69b609ee57c72e14727051d76b29804020c89fd273ec0eeb9020499e
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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