Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5f45d154c16869…

MALICIOUS

PDF

116.8 KB Created: 2021-09-13 19:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9071b702d5a361c65988f584ad1169dc SHA-1: 77a04e47a709618b7d52adb68e5a6779a6c846a8 SHA-256: 6a5f45d154c168698e07663f34337e791cf34aadda8295ce2154bca6db79ce96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://stickerbarcode.com/file_media/file_image/file/47077378236.pdf In PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/6689263496.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rtjtcq4vpj7v6pj7qeu3ue73h7/64400425370.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/73281976205.pdfIn PDF document text
    • http://plise.org/userfiles/file/lixipunuvile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354feadaa00---38727965318.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/87825593356.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/15236818153.pdfIn PDF document text
    • http://domosplast.hu/files/file/62588338008.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132141bc0c10---30302250721.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/9985457617.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/firurebo.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/zejajixazepezobo.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/17229319037.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/fepilaxosezowidofaz.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sonevatuvu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eef9f191---timiguwitowabifis.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/46705333584.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/jerovepaf.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aae685bb---65026327672.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/akq319sq7meg5l0ngqorsdoqj7/dadonigok.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/27382912046.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/dezolupasoguveroxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fgo+jp+mod+apkPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/26329121344.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_off00015c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2C 10192 bytes
SHA-256: a1993e7bd931bfd75636bbc8a154fb61d1e584833c8055f04c5b2c0a4bad5dda
font_01_sfnt_off000172c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADB 22364 bytes
SHA-256: 991f2e9e7cc9a93e3027e01a8a1c8fab0fcb0ed8290939de1f48feb2380eae38