Malicious PDF — malware analysis report

Static analysis result for SHA-256 314a756f293ddf04…

MALICIOUS

PDF

96.4 KB Created: 2021-09-06 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eba654bed6a02983b9ae625d47ea803d SHA-1: 3a15c1e56c1506fc2d860029a1f197733a9f8d1c SHA-256: 314a756f293ddf0495f93efa30689fc007dead5318dc8c293e6e494b085fd284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://archism.ru/uplcv?utm_term=ejercicios+angulos+y+rectas+3o+primaria+pdf PDF link annotation
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/e147874c5713d757e6275974fd9f0d3e/87612643817.pdfIn PDF document text
    • http://hanleyresources.com/images/44055100780.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/2769942933.pdfIn PDF document text
    • http://sushi-belovo.ru/files/bofelazabasi.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/rujekejinebepegi.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/7891875102.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4dd1b79a---tuguxoxame.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/85044514523.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kifujono.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/58116077250.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/13ea5a6d8bcb6c06dbaeda1efac628a9/xabirakizilasisiloranobop.pdfIn PDF document text
    • http://juentai.com/userfiles/files/58690953459.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/41145592282.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4140733dfe---wazukatamozexupelogej.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/21847309943.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade006b3cfb---roxinasifatabegefuposobu.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021080502004180554.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/21493895265.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/fataxoriwinowu.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/rigewapokegolizuzoram.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a3e303aeb827f77e43cd04d27ed43804/66254819199.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c96ebd1c---gesagud.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256433f37a---20989262009.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/a5l6lgo6l72ogho7m15ob4f810/44966981556.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/uov7grmbrbjmir5lap1d7o0h8s/xafavunovevugebu.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/zofukudilotima.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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 22852 bytes
SHA-256: 88050da4fe4c8d73a8466fc9880832d2bb68a8ea8618b0064373484ddaf65325
font_02_sfnt_off000158f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F8 11464 bytes
SHA-256: 382a1c7b5a6e0c47e33b126b79599c017a77bf09b83a8ebd45ed1bcea9d064e6

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