Malicious PDF — malware analysis report

Static analysis result for SHA-256 55198341162d376e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 20:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a2b55657deffe6707f47085b480e0a1 SHA-1: d22e475890deb41803a2aae81aa3e5d3d7ace14d SHA-256: 55198341162d376ea07ad26e1d5f6aa435bbd67f366c7ffd983c43606705a195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=mute+emergency+alerts+android PDF link annotation
    • http://sure2trips.com/bot/ckfinder/uf/files/rufabikuj.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/59606230750.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35656913911.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210913_17AF7D48A8206AE8.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d4e97e79e1183a56e220a6c92fbdb6e1/samalatemiv.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/33800964406.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c84254fc---lujemawegom.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9b43320f04a7a19765b8a59c513b5269/48037322498.pdfIn PDF document text
    • http://test-immo.com/file/xakunirenudede.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/32832024455.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/godagofazu.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/digixijit.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/66940358479.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/nakokopijazejekuwibogir.pdfIn PDF document text
    • http://synhbio.com/upload/files/fizasozemirufafajurinon.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/toles.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce23d5f40---ligodirekobetudufopaluni.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lukadejupazuluverumexukuf.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lirove.pdfIn PDF document text
    • https://biomisszio.hu/tmp/sakinikexemonuroli.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/43248916714.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/54946188760.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/nuwobijebofabesovo.pdfIn PDF document text
    • http://nemochem.cn/upload/files/naxodepopapopi.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xulasuzulekivuv.pdfIn PDF document text
    • 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_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 17624 bytes
SHA-256: 02bf955855bd1c8f78c2f9c418598aa1c5acec2a0f751377339548c151c5aa4b
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10920 bytes
SHA-256: 8d1e5c170b48f4fa728780ff7ee4b2bba61d59e10dd5b2947185b687e554bbb5
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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