Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59ccd6d5c810fce…

MALICIOUS

PDF

132.4 KB Created: 2021-06-27 16:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd11b9185bfc4ad0bbcc62d91d79463b SHA-1: b5c05ba6761c94ae84a081117f50738fa4b1dc74 SHA-256: c59ccd6d5c810fcece0aadfb29d805591d67a858cc3370f748b357d4c1a4e1f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the FormCraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver further malware. The presence of multiple distinct URLs on compromised infrastructure suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7701f7aa---21530029600.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076217da3b6a---sabupunajajegi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8fd5962b---golivemopasatodolikereduz.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jq82rercc6n83q56dp4ft7ef41/32501086193.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d68e78eda9---bujedapuzorulofagofux.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/rolul.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4b558143---wilopegivanamivejoxo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6859961f---67466467796.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f55ebe049d---28385841754.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840d7cfee9---32483575181.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f698650c5---73937989647.pdfIn PDF document text
    • http://gotween.com/userfiles/file///91337832102.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/36756326150.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jfoaqq8arkh9pdfb9fg2kqahsv/sironokodu.pdfIn PDF document text
    • https://termofriz.rs//files/27618132029.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/nntlu39mirbavpj2d0efb8ooqp/larujavirozipefizedinizow.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/fimepovazakobijedekujisuj.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160adf289b5d4c---4654181317.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e1a65a28---90258985993.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24a4dbf70e---23723126266.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kipigalilufekej.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/mefuzilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=religion+and+sectPDF 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_off0001a695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA7 18180 bytes
SHA-256: 22c5e5d5620190b94bc338edbea3f386e55f3a845a9c0788cfe1f88a07df7c2f
font_02_sfnt_off0001ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC59 10492 bytes
SHA-256: 708f28b3b72aa67aedd8b73302e27a14256b86050fc73e351cb83321f552b95a

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