Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36ff1ad02d89345…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a064f14490fcf682a7270175703029be SHA-1: 8bb1061a6e6acd12c8b2c9730568329143efa8fe SHA-256: c36ff1ad02d8934565e20f7b3857e61f0ab3e088ad246a0e65d8b35a10b80268
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The file contains numerous links to compromised websites and exhibits characteristics of a link farm, likely intended to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://comtraining.cl/userfiles/files/13083014480.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0cf16eec---wosofesuwelanowufubepaxo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaefa8b566---nutopelavuxekapuka.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/texelar.pdfIn PDF document text
    • http://ihdbd.org/upload/files/58181127587.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/sosuxav.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/20181627859.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/zeburime.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f90f19fe48950fe7cf6592db69ec2406/53101491136.pdfIn PDF document text
    • http://vaynhe.com/upload/files/wiletigatokedi.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/2775803539.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcvvhebodsg6u9075ml8kcvff1/wudulegajulumirujafutinew.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4782511878.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/webolovejiwelo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/rumeguxugisuwazemesar.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/95080368915.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/39921818335.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/52756678674.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gevenu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/33247751253.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/44709039894.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/visipozosasurezazunoz.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/56458112785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=street+fighter+x+apkPDF 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_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 17812 bytes
SHA-256: 7879260094bf8cda1bd93557a6439658021d468c314a2bd5aff38e4063358a08
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 10468 bytes
SHA-256: 0d0f4c558e85346292b5744e5d3ca3fbeaba75cd57d518425a19cff80d543c2a

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