Malicious PDF — malware analysis report

Static analysis result for SHA-256 771bd4e5dc0f2743…

MALICIOUS

PDF

115.1 KB Created: 2021-06-10 09:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6d14804bffcaad69d35dc252b8b21fd9 SHA-1: 254f7f18067a56174dbced33e1f16f4959d7d1b9 SHA-256: 771bd4e5dc0f274317d5269611e7a698808fb0c22a896c1bbafe77b7684ef7c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure related to 'Dragon quest viii rom 3ds', indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crewmak.ru/uplcv?utm_term=dragon+quest+viii+rom+3ds PDF link annotation
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1f3ebf538037e0bbc8799c149dde78ea/86396291625.pdfIn PDF document text
    • https://coluer.ir/documents/file/boruluwejojesanemo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78732325469.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/vtgbhprihc4rccdahr8l04d9g3/43605126007.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/ae3c528cabfe36c397762fe6c61c641b/65150532087.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec9dd7014ce83bda8c3504a9dfc7981d/zesal.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e288799a46bbb968c38adf5f44692d0c/kesad.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pavezalifigutupifufedenog.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/385a9524d7b88959175396e9438d9e52/wixopetupubozesib.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/3akqqfpe9g77qj6h0jnotdn5pr/79118457556.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e23df54c2691470fb9bbc08b248f3f59/56495953770.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/10669156528.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0cf8e24a---4374815549.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/85849713970.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160791969ef6f6---99111920464.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/55170735834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880efb2d23---76274325490.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001335a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335A 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 6872 bytes
SHA-256: d63c2913380da711ee0896112d0db910b1a23e7e2693aa6f8e4d2b1bea72c147
font_02_sfnt_off00015b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 5460 bytes
SHA-256: 77f73548057824e3c7ee07dd66bb48673b0f5a987f4cf503e078858331019113
font_03_sfnt_off00016dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD0 3648 bytes
SHA-256: 1b633d4c3b40fcf4686e9706e020f85d15dae8880f985a387f0ca43ccc664a6f
font_04_sfnt_off00017b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1D 13204 bytes
SHA-256: d2c9c7978f98d03d9a8c66472344d2e632674f0c1e2ae908e6f9f1ac8505471c
font_05_sfnt_off0001a681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A681 16240 bytes
SHA-256: 43f074d31d0a8e0b32ebfd34ae861f20fb55cc52dfbbd759cc37cb9bdecc92e9

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