Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fce9a78ac559f1…

MALICIOUS

PDF

88.5 KB Created: 2021-07-16 15:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 948327ca40b6e17ab7820d1b77a0387f SHA-1: 74ab68d0fd2d8a5d4eaebcbf597aabf1b9abbda2 SHA-256: 28fce9a78ac559f13cf33c5f368b2a25e02cca8f9cf107e5c796f4d96d712eb3
196 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering attempt to trick the user into installing malicious software or providing credentials. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised WordPress sites and disposable hosting indicates a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall pattern points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/4b3206d2bedf6482c806433b1394a169/22846510658.pdf In PDF document text
    • http://www.parinet.fi/tiedostot/files/vovilanolasu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087629876044---roduzogorewiwemezuzar.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/55996ad6fb07579c23b6c7b065259dc4/94718158565.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef5770d1b---62352908263.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d935ca82---92783509606.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160911f584a2ed---pejasapasinigojiw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b7c2230b---wemujofu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160814223625b8---wolapatu.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/28430467591.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/94b8c9805041dba224c4ef9fa0c02490/30972727248.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/28167072678.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/81f22fcd4cd221f41f8a742f8a05095a/gelod.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1587892b---21590838971.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e21cad2b6---vupalulogufitukapi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160787159315b7---xatifevozosesuxewi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/sexekuxup.pdfIn PDF document text
    • http://sport-way.ru/img/file/42745014734.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/fanugow.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/2010630807.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1258969f02---32754379048.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/26844433554.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/65dvbu48j01lrgi7vnso3bmupv/56367170254.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f5360e5d4756f265e02390997dfd41e7/72729856228.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/vemejar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+do+an+email+merge+in+outlook+from+excelPDF 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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 11024 bytes
SHA-256: 700f8ced53904c1098c57f631309572b10035eee864beea6da31ac4d3d9eed45
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 17636 bytes
SHA-256: ea2734da30a0cfe327f79dcb040f3737ddc84157c0cd11f3f44a1946afd1f333

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