Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceddd6739fc94654…

MALICIOUS

PDF

90.6 KB Created: 2021-07-09 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dbecfee273c4a7ffa10fdd4fbf9bfdbe SHA-1: d82d7b615fa334f9e1df3b409f2b2d90c3ba7ff6 SHA-256: ceddd6739fc9465488483ebffa62214850624f546d2ad00ee2e826942a41181f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised websites or link farms, suggesting a redirection mechanism for phishing or malware delivery. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a campaign leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=how+to+join+a+dedicated+server+ark+ps4 PDF link annotation
    • http://studiotecnicobonoli.com/userfiles/files/sotatolelikojuwufafed.pdfIn PDF document text
    • https://hgb.se/filer/file/xapegewatomilarumaxonog.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/4n438hbki4sb0jfg4fn9l5pj62/75583609981.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/niradegemimipagafes.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/gexoxosugewidi.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/wowelovepemadedukekufake.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e3bc693eb---jamisokapasidiwudumizit.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/98077155662.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160867ac8bdd60---53354914314.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/guwimovutoginejef.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/gogupakemopovimovutekaze.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608791b034a14---78612978962.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/37365747212.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/ligifuvovireterav.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc64d67188d---62514042986.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608408e466d16---6948205624.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rosolemijavufiwiv.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a13c2cef4ba9606ceb124461675ee8c5/filawufarobififebawomuwup.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99219412273.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160736f0513fd3---7427444444.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/nusedugokuzexesoma.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/37be1e383408579a88053b9e0910e20d/20036124307.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wemorogifedafasuxabujode.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_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10904 bytes
SHA-256: c6946d9da0de2e875ebfff4f372272b75cc7bebd0a8079c1d67945638a67b1de
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 18188 bytes
SHA-256: e4ceeb0b6be18addf8804f6e697c7861d93eaf5c5dad73fc13c6d9790d7e5af5

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