Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d2fde1181407d4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-23 01:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eb6c2f73990f150b14153c9e605d2ab SHA-1: 6015f72d77b336352686d29375cefc8d4dcbc535 SHA-256: 56d2fde1181407d44c0e1c1d795b15a77a95b77074a9e590716a13cb537fb9d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://chcial.ru/uplcv?utm_term=how+to+enable+cookies+in+chrome+iphone PDF link annotation
    • http://tobn56.com/UpFiles/file/wuxepomezadavore.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc62a01f0---22843310769.pdfIn PDF document text
    • http://lecostationery.com/files/file/wutalojusawu.pdfIn PDF document text
    • http://blueyee.com/upload/file/230534073533.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/12569052590.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0ac42da5d---67331253873.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/povitidekedilozaferana.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/32g6i6jjtcd9o16f05hr4fbiga/nawokasulowomofawojel.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///6648863201.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/65405944520.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/75320034874.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/89739176694.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/retutanana.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/nefizamemufapanigufegiwen.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/2064517830.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/99221523229.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/40245041807.pdfIn PDF document text
    • http://congtyvima.com/images/Download/84876621657.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/roruzewimazisibuligu.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zenuxavusuveworarul.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/fovepumixuxekaduzurumij.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/natepumiju.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fd0d25df58d997a44538b16e953a7d1/835729618.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/newetepejuluwawuboluku.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/14972897796.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/xizejativugupegurajen.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_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 17068 bytes
SHA-256: 4637c59a53ecdc102f7266a5c8e14c0048a3eb6c8fdd5be81b5dd5e8fee19fb1
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 10948 bytes
SHA-256: caf8f44aedc5758ca0ce409d5c4be33388519274dc5aa9fc4ad17567da807801

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