Malicious PDF — malware analysis report

Static analysis result for SHA-256 34db6bbf7afef816…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 23:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ffcefe6719f9485ef6f5679f23314df SHA-1: d04a60f7245dc132dd86b922c3c3ddbc9c96ba64 SHA-256: 34db6bbf7afef816dc2c2ebfe39e8181de91398f7a3ad477c7f01d1680424e97
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through phishing or by directing them to sites hosting further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://hotelclinton.it/userfiles/files/kegizigugisena.pdf In PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b14a61d550650e2e650f9edbe172a239/48162456119.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7vjqig2cmsqhi56si3f1ivimn7/72334934015.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcc426ae20---36396867970.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/85fd04739acd8a7bd5245273f873b3d7/situmalijosajen.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2cbb164e9cf0d577391806a10a91730e/nejarafemariwesokuwaw.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/33245855716.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34ba310e2---15022864733.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8b03b0b2c7fea4488fa36a1b29838584/51237260025.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/vipozitemiroweloga.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/59750095039.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/10847570441.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/fokirixod.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08f9ed52b---xinedazemonok.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/filivusovadik.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638eadfaf8---2173631159.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/85406915027.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88c2c5cae---50169733849.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/petelamuruwegizapo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d755e492018e5f7ccee5293747bfa107/37668964607.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/vfagbvisv4j5huec01fgniq9k6/66996516045.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/54631302680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tes+psikotes+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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 10136 bytes
SHA-256: b4251dd261193b9bb3b5a3de05c0d098f0523de621a7c19fbfbb318e3a3600e1
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 17252 bytes
SHA-256: 3c2160196b337c6e9290d4f72912790a06e6ebf0624db319fab020380fb479f1

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