Malicious PDF — malware analysis report

Static analysis result for SHA-256 def7766dd6b6a34f…

MALICIOUS

PDF

82.6 KB Created: 2021-08-18 16:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1bba2ba9e1f305efc9ac5090df233b38 SHA-1: 32ec19e20e9b7b76ca522f4d299056432413c6d7 SHA-256: def7766dd6b6a34fe3e644b778873a5918f54a425b1223ebde4327de4af4b85e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://fields-on-earth.com/48145736158.pdf In PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/5414613989.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1611c7453---tawesetusibomezokoditoz.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/82729517120.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/bosujelavipop.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/68995916925.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5538321f24---wovododajik.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/selewebelumewikazagofa.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/werowotozamidabewupi.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/18217851773.pdfIn PDF document text
    • http://prmakeup.com/Image/files/63357079625.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd570127db---98441509565.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/nepeja.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/diliroxajokimuguju.pdfIn PDF document text
    • http://ausafe.net/images/art/files/90262597617.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/kewopepilabipesoxuguvuv.pdfIn PDF document text
    • https://paperland.bg/uploads/file/fivasogegegukazijubik.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c67e66cb7---ragivujivaritupedigox.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/mopisozoxose.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/65893070147.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/kajipolepil.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7239197da---bawijesuwosopijare.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210716190908.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f5eb58ef851af7dbac1bf76d4a536429/8898862829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=baixar+livro+depois+de+voce+pdfPDF 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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 10632 bytes
SHA-256: e5bf26ae5cc9b61cc02066729cf9dc25c77884903fafe6dbca6106e815526f09
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 18228 bytes
SHA-256: 7dc8d56d8ac93cb3b99880cef237b8e568a101cda5063f721d449e9c3e99b6d2