Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3c466aa1f2fca0…

MALICIOUS

PDF

72.3 KB Created: 2021-10-01 13:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 456ef30f4271aade9ce469723ad2e491 SHA-1: f6123b4e2f819d533abe50c92ff5c41cd1e70ec0 SHA-256: 3c3c466aa1f2fca03e2bd75ac6e5bb9b4becb10b7fa9f66dbd6b7484a6610b2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=text+editor+apk PDF link annotation
    • http://rpsbchamber.org/editorData/file/9709771098.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/75038686764.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/67654741518.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/zefezamonolimelemibexe.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/12263101338.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/33255646551.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/ritoso.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/ronow.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614165c436c0a---jebenaxor.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/57985519117.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb41818d2---wufolo.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/13481869695.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148ee2f8ff36---rudokoxezile.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/90514425407.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/togewasavurosebufadur.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f9b8965e5---88175158431.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/9507797173.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/93167538591.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/68200030076.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/fifusorurife.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/44703715131.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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 19292 bytes
SHA-256: 1ab0a0ba757193cc464dbc61ae01603eea6d0a7a5f58521aacfc022e8a3af78b
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10224 bytes
SHA-256: d060abda9d4d9a43d0e4b826558a05e5c2d82b53823a675d62e39acad0d9e865
font_02_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1