Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7dab4f52d89e57…

MALICIOUS

PDF

96.9 KB Created: 2021-09-04 13:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 100058a1a7fa4e1913fc8cc116de06bb SHA-1: b84aa6222817dadb13209fea65bcadec576d6969 SHA-256: 4a7dab4f52d89e57d42fa6de48312e89fc313ddff79f7a85b7786d1f92fea4fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ad5a1ad0ff56dc83dfd8202eda9eaaa/48882789077.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f6a56d726---11328768570.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/30d84f542db6b0efb0db47a13be11b87/45261338891.pdfIn PDF document text
    • http://kleiberit.ru/files/file/88471006337.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/gozivazupegekopunu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1823cba9c---51983136231.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59e829365---70993717965.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/nebolaxuvojilib.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/81728771851.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/295c4a7d6dae8895268a597f750e9b62/sevuwajo.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/ruputatopix.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/taxasadewusuva.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/valewobiwizogedefigasuw.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/70756054717.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/vogosusetiloxam.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/11879638250.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/41429065744.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0281c3258e---2050645459.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b325d3c51---geviwaselenupomunaz.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/kufisikukimu.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/xezoxiwiropodewotevuvif.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b2b81cb04ef42337bf510369a7ef97bc/tefiwoturezazipi.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/68687115194.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/kugejak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wolf+hall+hilary+mantel+pdfPDF 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_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 10700 bytes
SHA-256: f26035edd316319cd6138d74d8671425e20d8e2dff129742da07471babc2e0c9
font_01_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 18892 bytes
SHA-256: 03e3807b634e2b507dd70251668e20606a431ba0a33372d46046ed12e7e0c3b9
font_02_sfnt_off00015e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1