Malicious PDF — malware analysis report

Static analysis result for SHA-256 390fa1d7efe57eea…

MALICIOUS

PDF

98.6 KB Created: 2021-09-06 03:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6837bdecab1cc210006998316006bdfa SHA-1: 2418d526ebcb752f3699aebf973c39f7a1a90442 SHA-256: 390fa1d7efe57eea7d2b66a73f6fb34f67198cb3ffbb229f0f54d342852c7dcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external links. Many of these links point to domains that appear to be compromised or are associated with link farms, indicating a potential phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 https://concertwristband.com/resimler/files/bumevobazitulex.pdf In PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/99770026413.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd1f2e558e---kevaselan.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rizenetozexebir.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/48881737640.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/jebelo.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/wegenubifoz.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/453b82bd2feca58a25c2cf3c1cd44c8c/munowejimumowodozipuridib.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hudfen4vi7n92d0815i3nr4haa/67052112254.pdfIn PDF document text
    • http://derma-dts.de/files/file/59288404950.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef21d35b75---porolakipunomirutuwir.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/l1r4fl41gd2dbksr7029vjc9k9/motudokaredozabu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5ee9804---pedulujefe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ka6cill1520bm5ond69khm8lma/mijotezavofe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a929f38d112---5812652453.pdfIn PDF document text
    • https://deepex.hu/hirek/files/gavikuwilosisamuzowe.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/wibexek.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/xoberorajimopejulif.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/52540388041.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fisuregopeje.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/58048404658.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/85173660729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=community+engagement+definition+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_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 17296 bytes
SHA-256: 9bdffb3a9b5bae87613dd963ea81a2336ec95776e1fea329c2350dbf9588b3e5
font_02_sfnt_off00016457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16457 10772 bytes
SHA-256: 50b15e6103dc6048a0f6cc3388541de2c317f8a81c8dfd3ba5b938b5888cbb40