Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f78abdc581edec…

MALICIOUS

PDF

102.0 KB Created: 2021-08-16 03:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90330d0f9014737dae457d38715d1a8f SHA-1: 39dbbc933ac7c07219109806e56a425c5475d26c SHA-256: e5f78abdc581edec9bb9811d0055eb125c48a71557c912d247cbe0cc44438fa8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://quimicasorocolor.com.ve/ckfinder/userfiles/files/lesurexejunedefenevaluva.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/j2b2d2j8ig960t3dgeef5sm9br/70789287050.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/pamugubinibera.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279755ea0c---84758967407.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/m1dv3lh8me76s6knqa6ul2d25v/84349535704.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210720042938.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e0a6330af---mosateninepebizatud.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bui3vcn3nu3qaue9ukhof02sfa/38442762078.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a763e61bcdca93b6d84b5fc524e4d6e9/80392562398.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/87597629035.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ba4d3fc7---jijonegiganusiriwiw.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff9b5d2b4---xipalugogukolaken.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xomijowizoboregifo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3e5b1295a8067011502a447ffde1792d/nuviwubefamogupopelubuge.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/46b079099f1ae17211c8082d542e55eb/wurolovibopa.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d6f088f36a5d931771878d0c945ac706/22231826955.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/pegetezo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c64a952a85b309608e3f8fe65be3e7d9/24399038749.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/jd9dlc0609t1e3d7ohf37mq6ro/porodamoxuzimes.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c66d3eb4e---88018957339.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/petab.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/wimosufipu.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/xozaluzebaf.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/44860379407.pdfIn PDF document text
    • http://ksmt.edu.np/assets/ckfinder/userfiles/files/bulasakufaberalomudepugo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f18e6777111---lomuraxebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=satan+una+biografia+no+autorizada+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 16684 bytes
SHA-256: 24edd53571014ceef0680660afdfc743ea1682e75f4b2df5659d8c195965f5b7
font_01_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 10868 bytes
SHA-256: 1c1761bfda296bad3584591fac1cebbf8d9ff0e1ef66978b6cd664b77500ad5f
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 19932 bytes
SHA-256: 11b37ac0500f5f6b137fdb67710c6289ea9dd8aa59d19cc6435f7a4703d5f408
font_03_sfnt_off00016ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1