Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b79235d318bdf13…

MALICIOUS

PDF

92.6 KB Created: 2021-07-24 02:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b824f37c12398a793587b710c295fb1 SHA-1: bb8b85a1b53b347f29e68f9d2b997a9649b2efb6 SHA-256: 4b79235d318bdf1321523aa0331264252a866ef93d13a03ec57f5864db2b94be
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on compromised CMS uploads and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The document's structure and embedded links are designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a541279f894---87634739753.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6813857b---xifirotojomataxotagef.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e687a7cb8aa---vozuvunazatuguroponevi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/96769090326.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210609_223615.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210628181357_208597622.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080929c30bae---xoxoxixepagefolavuviduwi.pdfIn PDF document text
    • http://digifast.cz/userfiles/jukitusodig.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/03d60dcf88a0c2bd1df4e76d46a87911/gigalenem.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/goxewijaxasezariluxapuxe.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ev8l91a45l040r568ofhnv10p8/sizugoxefevujuto.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2e075b37---44348907043.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/13931379921.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/zevawilorepajesewaf.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086244801fd9---51123817642.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/vulosozudorifetilupowet.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ogak05n23uvrg8nrdf8089cvl6/12091907280.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b210ced869---papewe.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/95521783895.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-13/20210613051019619442.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/91423053400.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/mawagaliseludajakuj.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cb1608a0c2155d08ccecade6310122c2/xipanatisopifozufudive.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6be4b9b68---44344254191.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/serutimutobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cars+1+full+movie+in+tamil+free+download+in+tamilrockers+2019PDF 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_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 11476 bytes
SHA-256: 971e5749ef585b6636384de7ebb2437d83d26da946948e7e5d4b57468dfbaa1b
font_01_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 17436 bytes
SHA-256: 4cddf654d81fcd760214f9f49c44fada195d26eeb60d6439f9b0849a95b80650

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