Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5df3600ac0a5eec…

MALICIOUS

PDF

86.3 KB Created: 2021-08-24 23:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 327db31c1f51c7b0ff8ecc4a1bf18156 SHA-1: 67c7e8c9f0a202f9f50b362d8f200f4be9f36871 SHA-256: d5df3600ac0a5eec99cb3faf527bbff67f783e0279c115689080b541203c604f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the overall structure indicate an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=limitation+of+liability+clause+insurance+coverage PDF link annotation
    • http://staropolski.net/Upload/file/38386817519.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wunowumidegikomobos.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wipisumukasijozu.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vobof.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/6975371410.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0a9fc63063c7dbbdaf2d1409b81f047b/nixato.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/tukikelejifeniwiwotalafe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e07ca0b96---xisusatonatavoga.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210609_235623_4134.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16114dcb106291---videbuzozojefozezutidako.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/zoletirilinigazamap.pdfIn PDF document text
    • https://derfo.info/resimler/files/49081617189.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc65aeb70ae---12924236151.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3a20479cfc7b4a6bb16d8ad9e076c079/29160714886.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df19754507---36178430737.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/tutazovasifoxuzawinuwepi.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/tojexelujesoxufutivuta.pdfIn PDF document text
    • http://olympusflights.com/files/files/54530455471.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/98044121741.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c866e36a12---tifujulos.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/78319836578.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b35f589c7c2eeaf8d84813b61b6c8ffa/fovupijivajuxitepu.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vipozorudefa.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210815032747.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608336f0233c7---tivazuwimizujusil.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16188 bytes
SHA-256: f092ea6f4c2486cb20d6db9422b123396bb89dd122b200539b96cb943432c6e8
font_02_sfnt_off00013092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 11056 bytes
SHA-256: 5327d93b77aa6964ce802185eb9a5c8b3eedd9a246554be3055248a6e1190866

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