Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8647ad2bff3f40…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea58a2047177f02d3de52bf0c5ed5a40 SHA-1: ac9f3a67403b88e4d3a5105993a66c1193ed93b2 SHA-256: de8647ad2bff3f404357d3f8abc05e08c075cf16d3ee24a588d8efe81f9373a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to potentially compromised or disposable hosting sites, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zovareni.pdf In PDF document text
    • https://srilangkapools.com/contents/files/58833571222.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/21455331241.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/99721527096.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a682a8e89874753ecec0b95e411ab657/gasojigivumowebezojix.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/posovu.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/judiguvu.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/92715786361.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/tunewapetotafanarakanij.pdfIn PDF document text
    • https://durimawar.com/contents/files/33436475956.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/11257c72f338bcbfb131a96c2bf4bdfa/bedibofofenipeditor.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/gerepiwiziwerofuvozinib.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60c59d36e---30435686685.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bazulu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///48082324234.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/sipobem.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/rabesudawugasuwij.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/95769221368.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/gelafusasebegibopa.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109070931256538.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb90ad2355---zugobenibaruwemilur.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/90088721293.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/tigesuxowiropedux.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/66718145574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+horse+barn+ideasPDF 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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 10660 bytes
SHA-256: b3014d0c075ff892598db01685859e89d7652ca8de1a25455d049f89a103fec2
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 17192 bytes
SHA-256: efd5666a582aa20d2bb2fa583ece401ba7acdb269c15a71e486a461b4e1c8f90
font_02_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1