Malicious PDF — malware analysis report

Static analysis result for SHA-256 f255512f3caf805c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 06:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d20576d64f8aeda046edafc137937cc SHA-1: f46cf017a76d3397900fdfd299304df3ef092148 SHA-256: f255512f3caf805c1988c995753c15aeafc06eccd04ea3e69104fd54d4a9fd05
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zosusikuzitane.pdf In PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/mageb.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/agghi4v1m3gp1nm6v30nvr72sm/watifalamupel.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ab0da4ee5---87554768414.pdfIn PDF document text
    • http://htwy.com/upload/file/pozefofonotaxukixezugezav.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16150691f912d7---rovelotezun.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff0d9343a---fojugerivapedotajuxew.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/99047589068.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff1d9468389bcacadd0746d633351da/xerulijemuj.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b6659ed1---sutigatobulowejukuragow.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/mexoleduwevisetenarux.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/xapegatejibodalotugosal.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/27563785529.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/40499031230.pdfIn PDF document text
    • https://theurbanthinktank.com/files/4963152741.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/gavukubibekevulopefegubir.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/94308953774.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/55318667511.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5afcba76989f66a5236072dde4267df3/5966425890.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/48711441235.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd5f5240f---90235167754.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/kuwaxirotugeligineti.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/9787799708.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615121e432142---59056629725.pdfIn PDF document text
    • http://ge-mak.com/files/96208304263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=upgrade+android+5.1+to+6.0PDF 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_off0000b596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 10904 bytes
SHA-256: aad9c9cc704d00380735b315e4dad804cb4ed88a6ee80a29b686240d2961ea2b
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 17168 bytes
SHA-256: 8adde01f2304382bcdf6d10207078da5978b84deef484e6cea44eeb69e53c88f