Malicious PDF — malware analysis report

Static analysis result for SHA-256 273fe7c5d1307d98…

MALICIOUS

PDF

116.5 KB Created: 2021-09-06 19:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84e53bf4f9b876217a5243f0b2299fa7 SHA-1: c2024de1f36fc6f7fe87bd41b8c184f21c8f895a SHA-256: 273fe7c5d1307d98d94692c4a4d945a06835c4d88ba4fab68aa158c334b64b80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4eae28ab---19349341890.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a050ec0a645---gobugefiduret.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3012a25b---32036824754.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/44358090378.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1aed9f285---pizunitilegef.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/kafofemebuzefamuwafet.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf4fc46b8---nogexasirowibitibanozu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4f31eea0e176a42eb51e2fdfe890c924/4888710638.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/muwoduselojosalabu.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/24650748506.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6173077d1cee8180a779ec7a2bcbfdf/68677074842.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5raot7ap5q64pe4jnhfpk74a0/rifugape.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/75946346322.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/nofenekalitematujukujikaz.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o11lmgjpi5rtln7i62mlnpucst/54313406874.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/wulalivabakimitatepigu.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7cb34123c---92545456294.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/depadumisemonuse.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/19116136837.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/guzirodazi.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/20951154223.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/fetemupixuzoba.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/62176562097.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/04cd50f22a00accd9c811a4f1ec1b1eb/zememoxuduxegij.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabd234005---nefanagufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coleman+powermate+6250+manualPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA9 10916 bytes
SHA-256: fd72038e1d52935ca98a1617b1fec7fd430a5869ff6ac8a8c9eb2e40c2606076
font_01_sfnt_off00017521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D33 20864 bytes
SHA-256: 5592602eedc24f6ded24f699e8f79419be3ff3b29f3713940914949a063e31a8