Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce382a2d43bb5bb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 01:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5341132482ca9188b6631b84e0497fae SHA-1: 75913b8ca65647888751db22a8b2d845beefa4f8 SHA-256: cce382a2d43bb5bb8960d75c45843ce7bb697de01bf61f69669a50f953f1f458
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=how+do+i+remove+an+app+from+firestick PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148c93a60f7e---84636044852.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/29374383197.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a4b4033c---xeloxatike.pdfIn PDF document text
    • http://koala-al.com/d/files/57654293608.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210902215150_a61de3.pdfIn PDF document text
    • http://markone-tools.com/upload/files/xadobi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/gafus.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161368c73a713d---31584282362.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/kubiguwogajakazixiti.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/89645522079.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fiwum.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/90363926593.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/gowukalukafamumetuwese.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903032345_z27uu3.pdfIn PDF document text
    • https://codecs.ro/images/file/dosopujolufabelejol.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/25811301979.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/89049a5bd329e2f3e1ee86f19a0a6210/daludimajodefisazusesi.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/belezajivufokimobusiku.pdfIn PDF document text
    • https://totszerdahelyikultura.hu/images/file/4315630153.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/monoviralusutadikotu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210904140031.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/zokiludenure.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/fekavepunudum.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 10968 bytes
SHA-256: a7d7b8679398202106ddc687b05f17fd100561796dccda14237de5882970099a
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 19116 bytes
SHA-256: 8ce933b3a0907b7a70d0371c7b5fd81d942174cd459e7e6e05ae232d1c0adf53