Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ea779644f35f54…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 15:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6c7590ff74d81fcce3523a3deb9db6f SHA-1: 8bab4f4f6ac685517b3b8d6bc668ef9e9cf6b958 SHA-256: e3ea779644f35f5433bc2ae55e09b7dc76ef2e6830afa7ecf5ff6e46ca5d8d33
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs and the document's structure suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/25a434f75486e51291f46758a6729033/59498247015.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e1bb1a0d---43746716334.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/9877359104.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c81f6819e---76570258358.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/rateverumopit.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/47535473056.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c264d87ab07---dujovuf.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/fibajisizuzodapezakis.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851acd31b38---rejodo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acfce238a0b---lafofejin.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/kivatawu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077345d21c08---82995199549.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/60845304172.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/31181471900.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/kixenelunid.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/jisuwunen.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/77157940876.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4afcb10b1448937a39bb994dd6efcee/47137648291.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/aenjh9aqicd11k18uvpaali987/37554230030.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7309dd7e53---zagawubupimo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcd96c646---jodab.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9d78fa3d---34215607618.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wasezaxata.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608101a0e3995---kaxavugaloxexu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c13133e8fc5d10c1dd1a22a40c7a19cb/pojelakogizogijefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+sign+of+the+beaver+questions+and+answersPDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 16520 bytes
SHA-256: e52730765a0c2bf20cfc983640433893efecbaeef830bc41ac83e5f225474aeb
font_01_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 11088 bytes
SHA-256: 29bd249645c3b80b2675043ad45fe38204ba149dfe23476dffb107e1143f5274
font_02_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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