Malicious PDF — malware analysis report

Static analysis result for SHA-256 a869653f7be2de6a…

MALICIOUS

PDF

104.3 KB Created: 2021-09-09 15:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f95f1883baa3906f01738af235af6a30 SHA-1: 209b546fb11e4361098a27548621b46d237a2864 SHA-256: a869653f7be2de6aabe10977f717653a34b4d65bbae5eadd30e4878875d03021
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://webinaris.blog/ckfinder/userfiles/publics/files/mebawutipizakiwulejot.pdf In PDF document text
    • http://willbramephotography.com/47871694104.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/89667560218.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/86900845828.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/63549194274.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/72344760863.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/22567116320.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161390622db339---pewunegixulowejipobi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3d94eda292c2e5cfc94c7d0980e5d098/zifabi.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/3851513517.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/48530407916.pdfIn PDF document text
    • https://kimcert.com/E/file/4881292140.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/45171535703.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/71711691489.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/95178124143.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/08602c8d62e616635790419d4abe43c3/21619846670.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/rejosukezi.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/masef.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/55905636155.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/godifiredeke.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/3176066472.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613875db78cb0---21634647457.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/vikatopuwaxuguziwelod.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/13258413698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=key+of+c+family+chordsPDF 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_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14840 19712 bytes
SHA-256: fa2498ad57c8385f408f6a39958d3ccf417c5a4b7c701a22d6513cd184d0c110
font_02_sfnt_off00017b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1B 10644 bytes
SHA-256: 62e1e6975b39db0c21a3ab0bc3c0ca66be247aa14aaad5110bde7ddee10f607c