Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0d42be0a4526c9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 11:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1447dbd641e8c0bbbaa9dd85c6b49c74 SHA-1: 9e1a69500ce6736b1d49b835cf5faca420fa495b SHA-256: 5d0d42be0a4526c9487e1f362eba0fb26082ca4228b5aaedc72cc3891833e750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely intended to trick users into downloading malicious files. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a lure for further infection, potentially via JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aceonlinementors.com/userfiles/file/79617255603.pdf In PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/vilipoburivizogopumofe.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/nixolisaxepajasepo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d3ff1348---lalajosi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bc065a1c7d3cc5de4161f4c7a9642faf/dabenibi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/39874093008.pdfIn PDF document text
    • https://siroyensao.com/upload/files/92624441189.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/60328d0e93e19840e180bff9b9850e22/90343239652.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c4677f1a---lapanalevipe.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ab6a844d---xusatavurifizezavoresis.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/82846021459.pdfIn PDF document text
    • https://loctra.net/userfiles/file/jubax.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a451a0d0---samosefalexig.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e75ca46fd80d0e7af312dfecb7fe76e2/vuruluketutazelarajow.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/25312634435.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fju8dir75psuv49ic0632ub7dk/kanikuzifenedebitenawawug.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6a01b3fb5a3e1399aab1aa27a2c81e3d/pefororufapibirewon.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a7a62054a7c7d29836ac2b44183092ab/tulenapitelad.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/77569049433.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161235bd600130---35784479271.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e4fa1a7f3---59351198688.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d0810006---50257259825.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/57481980989.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/41857033115.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aea22ba6e---pokaraverorazuworidivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=asus+vivobook+s14+s406ua+manualPDF 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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 10740 bytes
SHA-256: 00b30e34b115f078b301c9b7acbf584ad200190daaeac892bdd5a3b2d6d29fb9
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 18880 bytes
SHA-256: 0a5e021c787b0335ed413536f9efd206a2446f99c27e479cc88e5d72f0abfae3
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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