Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c57340f0e20305a…

MALICIOUS

PDF

92.4 KB Created: 2021-09-19 22:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea796e7df23da1974559a7f8d4cfe88c SHA-1: 1687b9a5888c5ebc7dead7c34ddbca088bd8ae14 SHA-256: 9c57340f0e20305a8dc3d54c74254acc688fbb6aac67143cb6787b2c0ffd0345
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wotfiles.com/ckfinder/userfiles/files/14096639590.pdf In PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/6090832634.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6ce1ec65---wolod.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/95cbafd2248a9a94d37c155ee1ee3642/koxorapegunigavumosavepil.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/66438764677.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/fixolunuko.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cf29409d064d8771ad1112bd18137809/simexuwexuvaxixovatavelo.pdfIn PDF document text
    • https://le27.fr/docs/file/navijiwi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161407cf336491---18472089263.pdfIn PDF document text
    • https://thehouseproduction.net/file/58418281744.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/94358491435.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138a356d3879---21792494575.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/detid.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/papod.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/25353872933.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/80829807081.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/39122667040.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead53d0b0a---bixofedobajupa.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/21457394041.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/40514853272.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///36901326309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+sex+games+2021PDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/nikukukixepitenavekejodu.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_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 18172 bytes
SHA-256: 10ad9511717977a282eddeb3c6f616639ab78e4e7393bdd69604742bf4e44e1d
font_01_sfnt_off000134d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D5 10364 bytes
SHA-256: be20e57b6ebdb1397376884013017f561980c8cd011ee35facd83d5dfe38d93a
font_02_sfnt_off00014c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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