Malicious PDF — malware analysis report

Static analysis result for SHA-256 409f80f243e96b34…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 09:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 01849ba17496d6e16d348ab0147d40d7 SHA-1: 847cdebedb0be37f693abc937078682f824c4f5c SHA-256: 409f80f243e96b3455fe328de722528cbda60d491cc392bcc75fda66a00886ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=lost+my+voice+and+sore+throat PDF link annotation
    • http://velapower.com/glwh/UploadFile/file/2021092604064673499.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/75109732375.pdfIn PDF document text
    • http://pololanna.com/user_img/files/47469508301.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/tomijebogom.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gizinepebatesesuguduros.pdfIn PDF document text
    • http://metallpress.info/files/mobowijumegeliniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140159383ed2---83970131727.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4c152ad2---53038277217.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/90692137061.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/xolagexonimugodufizidurew.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/5906042901.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gogis.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/gemamopebuve.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/sikiwemuxusudij.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/pitiwi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/suriv.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/fuzepijevotevuvex.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/92371558660.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/82619431237.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/42682893703.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/50538188877.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d40bb76d0d---naribakuw.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b8541f838010f18d376d31a91a293a36/votiditonuseroxusumalobom.pdfIn PDF document text
    • 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 10724 bytes
SHA-256: 912d3870dea6fcecd4c180bf88a421727191fdf73b188b575453b4c1fbebd44c
font_01_sfnt_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 15888 bytes
SHA-256: 11d46f6586c1959546df2c823a606e043f5ca9c5df15a2b025bbc35c74b9659c