Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f4664e80339c8f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 19:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aee69fd86b6c217daedc030f6ce897fb SHA-1: c40d5992a12056c8f11946b05e0777196c820c1b SHA-256: 51f4664e80339c8f7060b876bc7773d6bb4a50c3020e3b63864c6cfdd0c243e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest it's delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=mullerian+duct+anomalies+pdf PDF link annotation
    • http://malir-naterac.info/UserFiles/File/zabudejeziwi.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/45211243469.pdfIn PDF document text
    • http://montesantangelo.it/files/files/3195718901.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/85677306547.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/89618139348.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/444835566.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc66064052---32325772141.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/jorojoxupekasozakapebosob.pdfIn PDF document text
    • http://philipsphotographystudio.com/mekin.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mitufadedak.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9346859762892aa9c4d9c89b8586e868/zumaxorazop.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074632c03c29---xuzofadisatutuvomepara.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2bcde099---rumipupugorojoderu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0b8ae41ac---16835114136.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b582dcabb556e6c5ec497ce80bfdc26f/lewosipa.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/kisusu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075452a40f8d---6953347458.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57783a65da---27939557637.pdfIn PDF document text
    • http://stattus.com/assets/file/tididagifelobufemafow.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/46277469609.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160740eb66b8df---95724203453.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gj4gp4qjsm370r1hmjbharmli2/dafaz.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/96113655070.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607162b3400a9---gujixag.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9rccqv6dd335gfkp5asa7rpls7/68465947089.pdfIn PDF document text
    • 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 10876 bytes
SHA-256: 25beb24372c58c75911dd9a654f5f71c5a1d07fb49f53fed75a2e9cbe37d3268
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 18752 bytes
SHA-256: baeff9a47486281bef41f908a6be11475bb29f655f098e54d53d043a8e6148e7
font_02_sfnt_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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