Malicious PDF — malware analysis report

Static analysis result for SHA-256 585e765062a0eba3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2c9791c0d0b8503b56421a43e9c3871 SHA-1: 5c895fb0304828bbd39aa6244dbfd2fa24d10e1f SHA-256: 585e765062a0eba35a6d8d85d5dfb9dfdae638d3520c1d493fea1c313dc5e7d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

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 https://shen-su.eu/gfx/userfiles/files/wedakasapegogovonanuf.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sezubofoxus.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26353916731.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jq1p01cbrd2584cptl704ri86k/jimosekarotum.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/69537720836.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/49730142789.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/letezavelu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vikenozunovozazokotibeluz.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/nivopolojo.pdfIn PDF document text
    • http://skene.es/userfiles/file/moxujovuni.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/54540848328.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc200c86e---52889131338.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908124225666072zgr0zwrn1hx2.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/84639965540.pdfIn PDF document text
    • http://musikkursus.dk/userfiles/file/58898967257.pdfIn PDF document text
    • http://anpharma.net/upload/files/17328860228.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/26868858039.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96318f6d8---joloxiwemasijotizab.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/dabadodejetal.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/28853934623.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bujugawumijubexasiwozaki.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/25405176308.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/67457104816.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/74812233733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tasha%27s+cauldron+of+everything+free+pdf+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_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 11260 bytes
SHA-256: 5d453bc78ca532974949d54a0aa1f5246236c3c07eecef6b0373643c50dcb5c7
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 17636 bytes
SHA-256: d45e7dc5ad1aab819381d4d8ba5f9fe30228ca2f52d3df26e653b1f309800607