Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a236ace0f75f281…

MALICIOUS

PDF

157.1 KB Created: 2021-07-23 18:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c68b3d3a966e19e0e97e3887e1463281 SHA-1: 7ac644b055b9d3931c9762d46b1a1a7b5d324f97 SHA-256: 0a236ace0f75f281ddca543b0cb8ec9305e3052937dc3fc07cccb0e92d976a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised CMS uploads and disposable hosting, disguised as a search result for a technical manual. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://abzesolar.com/uploads/files/fifurudaf.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5164e4b72d---zogame.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/sefisizaj.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/96444202823.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/judonewupap.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j42fo33ig7qsh530rhmavr6i2m/47232597544.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e81c2f978---5051479881.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/zadidoguwofizajalawijeg.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210607211412_niiwpg.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4e79faa16dfe76597f9e6effd850d495/41593448632.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ce5df0c9c2207ecd406c1360aff5b3fb/32707728169.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/wunige.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/desegugevefitazakizogu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc04e0aa76---49222925423.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/tapijefekaxupuwupodux.pdfIn PDF document text
    • http://airfa.it/userfiles/file/razib.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1fecc702---daxakareb.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/513cf86e2212ed148e33c499bac90409/defetafaritikejosekero.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/volufu.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/5249832427.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/tasiworoje.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/zeziwudujebewotul.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/rqvkgovlsr55dlpsjtitfeubm5/kijati.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160856b9367e8c---34534258939.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/992660374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aisc+steel+construction+manual+15th+edition+pdf+free+downloadPDF 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_off0001fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21311 11240 bytes
SHA-256: f8dbf4df4006e6319f1ac0dcd5f3f3e4d7426f16c20066056589f02154ab5002
font_02_sfnt_off00022d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D64 20972 bytes
SHA-256: d793af10ff9b74cbc6bbfdb2e909013e83fbbaff73b1a70b8f851a2170251917

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