Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adc0daa95b147c3…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 00:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a833104365898146ce5211e5e95c288d SHA-1: c04c96e0e2010b197fd9565ed469bb5b12312ae9 SHA-256: 9adc0daa95b147c3f5de70700c4b907dbeb6ff1bb43b6d39488df3ef804312e2
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=is+ldplayer+safe+for+pc PDF link annotation
    • https://mywayrtk.com/userfiles/file/nijexowotatajipiz.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/30855919266.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/63514664339.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/napirivepaset.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/96893815606.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/resulemezoxijirosekor.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e29ce7cb996f176c3e3455056a54d6a2/tetulepilafonupoju.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/riwomilene.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/6621981526.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/1311782993.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/87737492895.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148376beef72---49676345546.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/g0sjgg161r0b3ht0ks9cuceaej/xoritinagekijede.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16151181720a86---8737538061.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/tevid.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/topaxiroraz.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/pobogoxefuturojiwidexagif.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/fawewugapit.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gubovadusuga.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/liboxuwiwidalebog.pdfIn PDF document text
    • http://marine-inox.com/i/File/98178417060.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/laduwejirulaxobuj.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/kuledik.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tixoxotavuxe.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_off0000af54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF54 10384 bytes
SHA-256: 405b07c974d50459f3b87e4cfb4988b224dee1591e051d45d0f2e739e2b235b2
font_01_sfnt_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 15388 bytes
SHA-256: a1244c8a27fea9da8e6c25bd157cf4d8fa892ef15b0ec6afd4fa1ef6a6d029dd
font_02_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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