Malicious PDF — malware analysis report

Static analysis result for SHA-256 733d6127833f988c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 13:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96e0cd7bb7e0ef62158b01bb7603a0f0 SHA-1: 5aa2dda413c1bcce52ce9f719d67b922b04a7400 SHA-256: 733d6127833f988c909f6d1f1a90013947ddfc7d0c480cfc7fcad5b2c95fd0a3
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://autopratichesas.it/file/28026752817.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ac6405d45---70313152066.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078707ed950a---73845961354.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f58a9555a---74949173862.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/44247544438.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/rujefag.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/teraxa.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/7101045148.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/lalixebavenixeju.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/12882158717.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71b4b98639---watimakewuzemuxoxubigiru.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd4462562---rerefixat.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/59788368093.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/63296371018.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/pijitujewivemev.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zewomodomup.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bd87315f5ed52309bb56ba726021df71/23393524637.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/22528981641.pdfIn PDF document text
    • http://expresskaliski.info/file/57506153648.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/h7lt6r5sss5rf2n80dtcrl398d/78862627436.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c36f651ols6vk649qqibe95acp/27503508176.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130123643bc7---linivunufatifaxoletoru.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/wubuvuvadegijajorazoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spider%27s+bite+jennifer+estep+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_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 10540 bytes
SHA-256: 8d6ca779bf75c7b137498f3d9a49975dffde925238020569514c78aeed6fcb34
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 17952 bytes
SHA-256: 7d3e8f5d802899bd9f6e7c83907181374c80a9d081179d29863252d429c71d20
font_02_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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