Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeede730e852f7c…

MALICIOUS

PDF

82.8 KB Created: 2021-10-05 15:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 477b6b8f7bd43eb77919be36d0a51627 SHA-1: 619f75fcf0e2feea795fd8113832e2b4fd903e2d SHA-256: cdeede730e852f7c9c6ead2ff88a0b7a7942e970500c5c7e0282b24800fe5ac2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=license+plate+office+wilmington+nc PDF link annotation
    • http://cassotech.nl/site/data/ws/files/83048674301.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/mijomemuri.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/xaxiw.pdfIn PDF document text
    • http://watch62.ru/files/files/movapekevufamedamifi.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/somaforukugesunonekixa.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/84021844946.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/7988479814.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/94828710781.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/2127495898.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/32877311687.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210911083224.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/dolawusinonanajowanix.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b93b3696---75731615262.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/fudajuwufalibujutid.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/tesatekizovarovo.pdfIn PDF document text
    • http://conkheror.com/ckfinder/userfiles/files/58338191775.pdfIn PDF document text
    • http://tzsunup.com/upload/57327116240.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/92798254192.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/rojadudo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7770ae5fd---24988976672.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/42898213387.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6d253c5e8a2b2f7a8764354ffd039790/dirokedikiritun.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 18600 bytes
SHA-256: a62aa0ab39ab6b7b2452c321add704e201410639a206ac2677471d99248cd94e
font_01_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 10764 bytes
SHA-256: ed532e0b8eff5e157a0593eda16a3f6d627d971c877f9098ca01d3365dcd0312