Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fd1dc52ed68c11…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 23:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01162675fb1de8219736a247229c999d SHA-1: 10399846af9b344ba8b1b390c000e94a942e6414 SHA-256: 13fd1dc52ed68c119cc3cc8a9f58318e1e254671a6cf56d25da3bea14f35c38b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate that the PDF is part of a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malware or phishing content. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hurtglass.pl/upload/file/lemunu.pdf In PDF document text
    • http://siciny.eu/userfiles/file/86003422047.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vtgo1eck18dqbk21abfdugrlr1/53038828484.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/virixajafetofumej.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/71076224991.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8svg61btkivpghsjufv28d37il/zatazigaworitumuzewir.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098787b1a3e5---mapipumulital.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6i0dsiqssv6jt28pj92v8313eh/14755891567.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0656257001629293303.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/97737335857.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44355eca2f---pusarakanivipegapux.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/b40be57d811b60cbbe31ba033c6361bb/gifuwo.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimonejetupidivemifasoz.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/beziwiledegoxevabumolato.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7bdb46ad---guzetixal.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/goriduwogapuvuse.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17397162295.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/77965728991.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/vatekekisakivus.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/mudejifozop.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/94724216143.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/52335164288.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/794557b15b14f19069e6b5284cd2cd0b/ribafojojurino.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/lilukok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sample+resume+for+1+year+experience+in+network+engineer+pdfPDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16092 bytes
SHA-256: 16548c96a364bad8faed1e1c2dc071d1fc65cc390ccab490ee56dbba09b4d752
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 11584 bytes
SHA-256: 6696457b800a8cafd615a06487a7d7162f05f0bfa1aef9f78b93c0a6d3445f70
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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