Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e58233a8bfb7c19…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 11:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 669f08dc7f08918e0ea1689917867ca6 SHA-1: 2f36d47f7d854916c34ef0e0ae36adb8578be180 SHA-256: 6e58233a8bfb7c19a9b711dd1d03c2f7be29b9f16081f58f8b40d445f93348df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://autoscuolecasetta.it/userfiles/files/54380402930.pdf In PDF document text
    • http://esipro.fr/userfiles/file/jatapifokidebajezuwedowi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451b371d6c6---63811759435.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/59352309135.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614714faa5175---kosoxovipovum.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d11a5f21d---gijametenuk.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/2472380808.pdfIn PDF document text
    • http://afslab.asia/upload/files/56729753485.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/vifavurelejevogego.pdfIn PDF document text
    • http://anm-av.de/uploads/files/67815123590.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/sidev.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/37553520001.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/posavujokajilimuxebub.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/jarak.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/bamubiwokexegu.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/retadozofafolemaxuza.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/mosanexasizonunov.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jesabasopaje.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/92059154416.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c37b9609a---zivugorobuwovovoxe.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/63339706338.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/35277426942.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/romagakulobadupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kenmore+hills+postcodePDF 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_off0000c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15B 17700 bytes
SHA-256: 567f35341a35b82c5b79ee3d277b75bffce6196ffad824ba89b3a9b4c676bb67
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 10608 bytes
SHA-256: 4af3015bd94e3714a5cd5313c4cacea374bb53a59ac4c470180d1361275b55f1
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1