Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2ec0842eb45c4d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 08:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05371ec65f47fff1c1eb09e801367f85 SHA-1: d4b9ee63b02e46fc373a1af9ea3f9570c8b583e7 SHA-256: 4a2ec0842eb45c4d8912e2af539534144582437b1dd9563b2349d7a0985d4b06
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. The heuristic firings indicate the presence of a link farm pointing to compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff563abdeb6---noxepojovudufo.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/karatixadezeve.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984e1f64e77---93694170120.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/busirezusejigivokep.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0c735848010c21b8d483ae5a42b5a17c/tuvosozabetet.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/wevikijegopovitenede.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161134796ad2ad---supokur.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/76340647231.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315b0e138a---zolinosulivezeluxexozef.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e085edc5c6d8bb4f3646265c645f6f88/potebimi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c40a4a473---19550309210.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/bupajaj.pdfIn PDF document text
    • http://vina2002.com/uploads/files/tagozevoretasaziperosu.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/36443449245.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/531c610610a3958841c9b1b3879e6d9f/kajoboxoxulajudal.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/bizosagudonilo.pdfIn PDF document text
    • https://hoongnau.com/upload/files/78146774206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b4b83b68---fizimurafepa.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/bujujipumolit.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/fukogexuluxodiju.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/pijesowexekunowox.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab44f1869---suxifepokezu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/litujazane.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/25059302602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=5+manualidades+para+navidad+con+reciclajePDF 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_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 10912 bytes
SHA-256: 670ca2c67505d21bbb0cce2782c7885d55216f55e2313428e4c0f3d9b27742ca
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 20928 bytes
SHA-256: 32e27691fa3cd626f2f032c4e96ccd930223af38d6de70e82b18f37d63627025

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