Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ce3e2fd3eac391…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 13:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08820f2adbc26120cf5b3e1db176e619 SHA-1: bb2b2760d532a849a7f4f8569eccf4e2f262abf5 SHA-256: 42ce3e2fd3eac391c05abf28b229d88f58c6f5996890f57ec9d05845ec65a024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=android+one+driver PDF link annotation
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jekol.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce0b13fbe6---34258052809.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e2pq3lqpjrfeu9smp8u0gdqhk6/38179335860.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff6080fd9---86783920487.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/43141995871.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/dagogodorenadov.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/92081342324.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161343f30aaea2---73279222140.pdfIn PDF document text
    • http://a-pluset.com/userfiles/89217854524.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/sabadelavunegejerugunam.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/gatuzotuxifivutezaluzumo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16144b63376359---52123492988.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/wibane.pdfIn PDF document text
    • https://people11people.gr/uploads/File/82111833658.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/79186031242.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/panl4nrq936hcq295lriiq1275/ratokasef.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/239027205.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kekisutojola.pdfIn PDF document text
    • http://x-mobio.com/upload/files/kewanofipabadavixopukaku.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/zamotigola.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/wamegafonixoxof.pdfIn PDF document text
    • http://merwepizza.com/upload/file/juvexeg.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/vezonazofagazagefalasaz.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d9d7be69ee4b08ac79a2f2ee29135c8/wufenibusuxojiduzalipefoz.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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 16324 bytes
SHA-256: 6b0d15957edea7b915b18c0aca6cef1b371210bce3fd686d53d67f26db228139
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 9816 bytes
SHA-256: 8faf86858765fd1d6b10a47d3138acfb8310a4e3a861831be4f76e76fe7e3d4e

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