Malicious PDF — malware analysis report

Static analysis result for SHA-256 0511f6bca9ac1fc8…

MALICIOUS

PDF

91.5 KB Created: 2021-08-14 13:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b647b373eb0933c8cb817549e2308b0 SHA-1: 7b384b510a07aec9169ad3a0307e25e6a3aa4b5e SHA-256: 0511f6bca9ac1fc8f7fc0f91ec827640f07505ae7209daddb75d50c7c2575a56
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised WordPress sites and IP addresses, likely to host further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/7ia966faug1lgg5cg7ataqhf2t/68363957432.pdf In PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/97645532946.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/loboxitodawajekewunume.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lo5nrlub97klcnvct27onmj6vd/zureraku.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/78eb411bb5ebe520b5e6620b6190465f/kakusobovukap.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/muvesapememarimupubojunob.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/7047523390.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zafesobuni.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/memelibonuluvadezogato.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16112b91c10984---dufigejinoroja.pdfPDF link annotation
    • https://aadhaarretail.com/administrator/imagetemp/file/sutiked.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5e547114---wudewubuz.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/jeruravelalezibe.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/bukibor.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16098948c881a9---giwikoxobotitalupimeri.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6571aed4e1---46068411750.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/3741980781.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa0b926c6---45942357522.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/rugiluwufevul.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/usr15b4e2ja55k1otpkfejm4e4/28656617287.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/kefisuseniwoxevisusazoxaz.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/fodobuzusewem.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/xepuvamujetimeguwowopenob.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7704bb793---57693026894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=coreldraw+x8+crack+software+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_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 17232 bytes
SHA-256: 5938fa095c46bf671a72f8738bc96c446667cbd420351c902dec04301015484b
font_01_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 10896 bytes
SHA-256: edd9d2ef0b041f99bbc7480c6e349f5358804734eac3fe3b2954fe1c9b5c82b0
font_02_sfnt_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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