Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b10acfe082d984…

MALICIOUS

PDF

95.6 KB Created: 2021-06-30 15:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e98e1dac41a4ca3617494a99649b28a6 SHA-1: 31a9bd7969311e5c0ac6813a03108c13b7312850 SHA-256: 35b10acfe082d9842d342e69dbd885168a62d3b50b5a339354685f2f0e54f99a
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The document's content and structure strongly suggest an advance-fee scam, aiming to trick users with promises of prizes or funds requiring courier delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5f2ee988d563507942b5b3a2c77b268d/19750140133.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a7026fbf---pumifelovebemurawe.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/javejudazigoledipulebelux.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5f816ab44---zetajaliwoxerugi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609975dddfc6e---20808865037.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/35510328369.pdfIn PDF document text
    • https://magerp.org/upload/files/22856134088.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/326be9132ff1b28b7147edac8041eec1/lewarefipemopegugupev.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/esjhc91otrpoq4m20turi1j91t/rakomejidupurizopab.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0tqq69rsv9r0i9glbfe6u2qs9j/87604819845.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077698dcf6e3---70054962654.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/004bd575ea1730e1e915a714150ec2a2/72994452261.pdfIn PDF document text
    • http://midel.me/userfiles/file/sosesudikowuluz.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced04becf0---gudizelurizotilox.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/77091713682.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f6a4fe3f202f0839f7543cf87d9c1ede/59050672228.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359809b939---24348149720.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vageziredowagilabejaxi.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4efb61c8f---golaworaj.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e004a337f9---43426061913.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/duferuvotulov.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/55587203931.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/29c98c744a7a8ebca152b5500b0fbaa3/gafonezasu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c344d966---44934089796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+year+were+you+born+if+you+are+65PDF 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_off00010e8d.bin
f4c98b23a07ee2cd8afd4942460795d3beb89085cd04bfc220e7055b18bf9701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 18224 bytes
font_01_sfnt_off00013df2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF2 16792 bytes
font_02_sfnt_off00015609.bin
61f8e44dc818c9c97065457bb2d074a44e9d71f016d248e82f780f742f1d12de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15609 10832 bytes

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