Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc90b1f420ce4e6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 12:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d889a44b1f7985807111e1b71a9954b SHA-1: 9fe834ae04ce3b3da5dfdb41dca7b5adb0c3318e SHA-256: 2dc90b1f420ce4e651c7c7b90ce7cd1e62a9f4520a9085543892a83d0b043ec8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jbdclothiers.net/emailer/userfiles/file/21222410275.pdf In PDF document text
    • http://ranch.pl/files/file/4994268620.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/kajeleruxojalipevudewuxun.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/mexokunesa.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/94175353412.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/lipikib.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df80f30d4d---wivurimoxup.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/5947256350.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/76692351727.pdfIn PDF document text
    • http://tianfonmm.com/d/files/16311632300.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e64252e888297e63504ec5144e2bf0c6/gilogitowaboja.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/84541137811.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/18295040378.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/16402640226.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3bcefb1f7e7d5766d2a713154100d066/fejexej.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/12425324773.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/81081235121.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/4925413432.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/munofatoturafu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b2d1556f4d934cfca19b3d0e8cf3955a/58114328356.pdfIn PDF document text
    • http://kdekdyjak.cz/data/6712524178.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/83246100728.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/pexelo.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/sumurula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=life+simulator+games+for+androidPDF 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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10752 bytes
SHA-256: 73a5ca3bcddf88dc734d6cf2dccc114ec8ff296708a6c155d3d46ac13f98a5ef
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16732 bytes
SHA-256: 8f2194b9e6f54c720ec6d70b3b9247a1eccd82ba4337157e5020732466be1baa