Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b44723768291efd…

MALICIOUS

PDF

92.1 KB Created: 2021-08-07 19:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: bf07c6b54fd5a52fc103a396f2c833d8 SHA-1: 6a74e0b3b3c13999015de1ff87796a41cbcfaa1f SHA-256: 9b44723768291efd584a39355f036acb7ae48d3bd216154d05b6c6de492a1bc7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users into clicking malicious links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bbmeti.it/userfiles/files/pukenowunusapugokozobaf.pdf In PDF document text
    • https://qian-ho.com/upfiles/editor/files/50029349749.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b348df3b73765e58f103c4d965516abf/26341334293.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/18130984795.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/63666746038.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/dogoxomaguxalale.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/romaxid.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/74269091880.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9e60e9a6---jedutirolomoman.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b91c3757---jigidawizekafafuv.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/rorazudobulotexap.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/846ad2ded464c87e84fb688d250554d2/lemapusejuseniradewatuve.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/54413149854.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/molagetegurel.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1f5173d5cf24d8064620bd3b12d9d2bc/46829763068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dictados+para+6+de+primaria+en+castellanoPDF 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_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 18624 bytes
SHA-256: 51b9e2be0058c50f8ff5405e4438456e719e9035ec169ab11250f58abbf26bf3
font_01_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 10844 bytes
SHA-256: cc4d8e4ef63f992702f26e25cab24f29b6298e1394ca91d99c10660876c7d767
font_02_sfnt_off000148f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1