Malicious PDF — malware analysis report

Static analysis result for SHA-256 11893fee6809ebc3…

MALICIOUS

PDF

129.8 KB Created: 2021-07-20 00:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db9daf57b17887cfd25fc3c63e4e8d28 SHA-1: e0de221088b5eb8481fdae0ac3ee7d750c6b76b7 SHA-256: 11893fee6809ebc3b952d2809a162eb206337345e90a3da4adf0c37b45a2dfec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c704ba9add8---fotewo.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/adfee37863ee63fdd7017cd0f8de0d5a/6537574026.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/28523289799.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a552be132---59854115994.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87097e79deff4d9b3cc4ae0b8a63a72c/munidemuxafokerom.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/28054630797.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a02f7db78---56296922360.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tewidobimimigosuso.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/16427483760.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b249b86a199---90033543556.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fewijajikoposajowavi.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/zitisunesawepezipanovusa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc92d8515---7802811785.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/10249984337.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a72f1c209---51860897957.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/suporadewageverukunuwi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0afe6d529---50901846986.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089de872cefb---neroraxakakoji.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/050f8cf1f8133126cd28026c4c36fcb1/jonoxomizum.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/sumevojiwikudafowukudo.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/684046682.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/51561944694.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0129c642---72647846286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=schaum%27s+outline+of+3000+solved+problems+in+calculus+pdfPDF 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_off00018e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E95 21020 bytes
SHA-256: 09f64390f2266e0269761a23a69a3411a3f85e9e4420046742b0ba4e1c81e803
font_01_sfnt_off0001c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C60E 11596 bytes
SHA-256: f659d1a6f1bc181d1f05a2bebab0558324de6d2c0d3beeee79828849f33f418e
font_02_sfnt_off0001e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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