Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4285318f1fbfcd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 12:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97dd29afe61aae6b42199917486031e6 SHA-1: 32a4db70262972711f054cdc2be8dc10098eedf6 SHA-256: ad4285318f1fbfcdc9c45649f88496f236b616672104dc6df8ee370f725a7563
204 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including random and compromised CMS upload links, and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF. The presence of a visual download button further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vaness-sens.fr/ckfinder/userfiles/files/mevilizefizozotosejojiko.pdf In PDF document text
    • http://xfswchem.com/upload/files/86635754292.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/wikesopax.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xifagexe.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/suzeribiwetifas.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/lejemitetowutesib.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/49770067445.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/65088668692.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/welirariga.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/kusov.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/29583615916.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wijajofasekezurejakikos.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/52261062703.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e30de2c1---fesulerejobuvorojegodape.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/devirogag.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/bizuxusosajekiwovopule.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/007e66f6151d9fee14fb9295d2241b38/xekigizavujo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2381a89c8---refinuvepazimu.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/48508690563.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/vosavoxanukanabefap.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/30006568375.pdfIn PDF document text
    • http://glassick.com/userfiles/file/52538746764.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/fafafudozigewuvaz.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613088e748225---71306536463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=english+hd+movies+downloadPDF 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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 17224 bytes
SHA-256: e80f8d46340a0710a384420b7054b06457b2910d8d0a06fc2d0afce9c967e941
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 10632 bytes
SHA-256: 9ca501dcffa9d8363ecdc9f17a408d06110e72748f721a6bd4ce9f0dc0dc4ad1
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1