Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf11423066bcc0d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 07:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eea395a3544c1dbbd78efc1c45b8e728 SHA-1: b84d7ef1ecae7c2e8c594d48ac56ecdc82d5b1b7 SHA-256: edf11423066bcc0d9a9ac015d85964d2b013b1ca70995becde370cddf84e464d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file likely serves as a lure to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4a1b7c348819bec8b2cd9847e6a3fbf/63339424838.pdf In PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/78600260928.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/xawes.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b6aa33707---42111885507.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb50360a79---papexe.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/fesapuji.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210606101147.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/28037223419.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/ziberupojixogavifinumomed.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b423916b7d---betekikalanarididutusav.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/wedizawi.pdfIn PDF document text
    • https://norservis.com/files/files/roxilagirogebitanerasuxa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fb068a94e62162e24dc4afbf07da0c6f/lubemurol.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/47389239725.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/89482752840.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wipegusovovomewuselo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/zovelonewo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/031rcma6er47asgkg52gr9piu9/sagem.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe25104ad3d---tarugitinowej.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hnucch7882c0p9sjjr5dkr1a42/25474099798.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/69784354094.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d853515cd8e---17932545881.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e3cff324e91a24c3c03fdc78d13a3f32/60132501801.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7c2cb77922634419d110b0faf007f0dc/momapep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=meyer+sound+mina+manualPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16064 bytes
SHA-256: 269611e0863a71aba152de6b226a80c96e4ed7a79fee7cef0037cb2750d6fe64
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 10516 bytes
SHA-256: 8c1a991434ec6017744b944e6dc38c6ca82f8ece0d457d434b3e8bfaa0bf1d32