Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ffadb6558073f2…

MALICIOUS

PDF

99.6 KB Created: 2021-08-02 18:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f414d5592c6636d2798b72d1de471e20 SHA-1: 906a157986c18edb76dad88d56297ebeafafef87 SHA-256: 51ffadb6558073f2b408a1518da521aeef31a7aba219772851ab9c51fcef9422
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/82e72f40a6314b2761a1dd372e6fc6e0/sagapixosalor.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/71d9f1542e077e076a391148f9dd6bd2/xulidu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/13144415273.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d9bacf15e---24929670379.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gawome.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u2ippjs5ffp2igpbft7ft9lk63/manuxowumaz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bbf8218a9---xijenirokug.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1a50024e7---zizusipofeza.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01bc725a13---tanovixuloj.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fewajudemiwalavora.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/56c28c3fbf71c8beafbcbd5518ec645b/mogosowuro.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/464585873.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gerokonovesugedatuvelilux.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a90bd92c---7266920139.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/87441066716.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160957582eb70e---79423785925.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/dixarakukewak.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/lewerowomufipibatilabu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a959934f31---17698010700.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/92031666768.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86937d6ce---falexanujus.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2165700e07---85903432179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+biodata+format+for+marriage+for+boyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 17364 bytes
SHA-256: ab4eaef4fda1692cf5e0b8417e9f8746ece969971e879eef7fb9d5e09be75987
font_01_sfnt_off00014ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE2 10856 bytes
SHA-256: 9e1b8eebde52ccd6ec3e057e693eb639924fa666b13bfcf168557e62f545748d
font_02_sfnt_off000167df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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