Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ec64b7bc3f9e25…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 12:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 965238a216d6aa9c1cf73ca37148c347 SHA-1: 3cd73ecd27505aea4ee1b03d807eb6cabec05f2b SHA-256: 20ec64b7bc3f9e254c4e87356848001f76a2575aae126e72de7b4647b8796d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://younewstoday.com/task/userimages/file/94026203941.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b47adbe9ebb---vozalufexobute.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zazunosiduwolexibatij.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/nakujalubeg.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609739615d702---24620884006.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/jugageta.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9d0ef1d2f---95559198870.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/fmhhomsv0arbj4ena26vce49m5/baxewidetajesuzavumogib.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/delulelegusegorevuwenexu.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/24923305993.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/bejedenamugopak.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/desekofevotazimotugekog.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/mg7vgk7nu336entius1djbdjeb/rojekokigijiluf.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j000374b0ueqeneeb5v5esuj1f/tazaza.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/31917559343.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/pq343jjvf6ofrnkml54ehu7b38/dopara.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/lanedejadejakiju.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ecl3pq432rgkk9o29e9hjp4b5v/33416991843.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/9246648117.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4bk85fbfm4j9bipddto9j24be1/20498839777.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/basosiwowosixebitoda.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/lujop.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/vifuzitodonovabu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/36908808478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2021+asteroid+hitting+earthPDF link annotation
    • https://earthsky.org/upl/2021/03/VIDEO-2021-03-21-11-40-14.mp4In PDF document text
    • 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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 17392 bytes
SHA-256: 98e31f489c05e3aa091642655167358d8ba93f9c0e69dfe19d8687cae751a056
font_02_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 10680 bytes
SHA-256: aba354277968fc639e289b7ef40346c9cfcdef1fc946537cdd909a854ce89759

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