Malicious PDF — malware analysis report

Static analysis result for SHA-256 18691a5e94e09ee5…

MALICIOUS

PDF

86.3 KB Created: 2021-08-21 13:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6da7b09abd158a95b7984890e1b1401e SHA-1: 1b4cb6193cb04b36e6685c431f566a6217b33f37 SHA-256: 18691a5e94e09ee54f9061e33b1fe1fa4a42d64ffef83213059a81f0b2bcc4aa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://oddluzanie.net/userfiles/file/bolelomesa.pdf In PDF document text
    • http://srhs1980.com/clients/877094/File/27351410996.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd424a8a64---62258589832.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6856edbfcbed554a34541aebe28582c7/vibalete.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceccc3ef10---20498256433.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/bugozefemubelibotefok.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/febazilemazavumajuteziga.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb168a593b2b71d9aff5086c17e53b78/nomoboxofasisitera.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/73284260728.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/renuveteletelifezisogu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611150f10d7a0---xumojovobiwevujejatod.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/bivuxezutib.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6118ef666---koxofemuxidibim.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b4a419eaa69f23320ae1cc3754097091/wubanupibumaxokeva.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/47744016650.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/29763011411.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/94778757449.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/29374516564.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9ae0a26d7---nasugijud.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/33849808487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shark+rotator+xl+professional+owners+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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 11080 bytes
SHA-256: c0b4ad219b235f25e772a073cba3ee59064d9bec175489c2c10fb3ab60d0d873
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 15952 bytes
SHA-256: 77cb0e1c9ae432dd7fd0e029174f1e24bcc16a49be7e6e5d642426d2da54586c
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1