Malicious PDF — malware analysis report

Static analysis result for SHA-256 b913f083c3ad3bb9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 23:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b845496eba42306992e778b36a0817d SHA-1: 61ab624c0bffb3a68dd8fc44639c27c909821f17 SHA-256: b913f083c3ad3bb9f1d9152418c0bcbf4d198fb74de964f0953d3092ec5e8151
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The document also contains numerous links to external PDFs hosted on various domains, some of which appear to be compromised or disposable, suggesting a link farm or distribution mechanism. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://bsa-billiard.by/images_from_html_editor/file/90514240935.pdf In PDF document text
    • https://korovin.org/site/img_ufiles/93650143937.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/27125618213.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/vizimofawepititaxewewaju.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kipafizezemaje.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/pogoga.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210904_8F1E03591391F3BE.pdfIn PDF document text
    • http://umhouses.com/uploads/files/torowadav.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/73738302275.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/kixigorezuxoxekijax.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/45494040077.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/79806541301.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/70719380154.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/21001697612.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/30628290010.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/51227283916.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc883297d3---28726237440.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306285baefe---36803994366.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134add0bd318---dilokimo.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/vukalunepobivikigifoxeneb.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/6820743961.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/pesidemesiseduwikovefupov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=install+sdk+manager+ubuntuPDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 10664 bytes
SHA-256: ad58b26ae0f804a7f458d63b28fb795067c079249afc0e315103824e8b7cc2ad
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 18120 bytes
SHA-256: e11ee9d133c09e232dbf972ebc44c43cf13388e6261746c1a053395df59546fe

Open this report in the interactive analyzer, or submit your own file for analysis.