Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a4d5eadc6906dd…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 10:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dacebd2212a22d6b5c34b467c19186a5 SHA-1: 7caa5319b7a435e05269e41ca82e617bc95983de SHA-256: 68a4d5eadc6906dd4d289f28f63adb74f7fdd211f35e478ccef90b06f1f44bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=datastage+scenario+based+questions+and+answers PDF link annotation
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9e005be7967b68ea35b59422b49c9d14/silopabuludalumovi.pdfIn PDF document text
    • http://distributoram.com/files/file/86591658715.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/subesidadunumikeg.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/89452955616.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/sagulonirumesu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/68470160410.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2073542589048ed3208e742fb3e51a3b/38015524221.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6a250cd---94609836587.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/f9r09c1uqlb12v5c8pk4g5iq6i/12378414428.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hplgfh0nse431h8hbjmufemf45/vasuzowosajibozewemutet.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/pq4elj7ctiqoneqdskc7i1t9o7/53285726905.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071cfd024f9f---58293363660.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/fefunisi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092edd9b3e68---83578466708.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/890150766.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc17c0961---46604592542.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921d3de3e01---mezamozojupasoliti.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073062980444---zixiranemejinozinuvavo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/surijasuzupogo.pdfIn PDF document text
    • https://luminex.pl/upload/file/nisugixotapafilerato.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/53651438051.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0b59c48210a5e1c51f79c942c00438f1/xefora.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/38pgq91rcve3k5avtj371o33j2/nojega.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/29723672822.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/jegasuzunijekud.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d263746c1a---64730980766.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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 17248 bytes
SHA-256: e8410f00d98f07fb256cc1c3c52197b9842ad5427209d8dac3145d7e306d8665
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 10972 bytes
SHA-256: 28f3c60efdd93b4631de795850cd714c1c708564d383e4e686dc918b5362011b

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