Malicious PDF — malware analysis report

Static analysis result for SHA-256 d170a07eec78b3b0…

MALICIOUS

PDF

87.1 KB Created: 2021-08-03 13:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c38da0b425b611938238ee53b0b6cebe SHA-1: 5dfb1d99b23026123532ec9a0ab83a93b302cce7 SHA-256: d170a07eec78b3b03ae1c0e3cb0e693e7afdb281317a4f08bf833f0683d1ff7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 a link farm pointing to various domains, some of which are compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/uplcv?utm_term=download+script+diamond+ff+terbaru+2019 PDF link annotation
    • http://contactconfiance.com/files/files/sexefa.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/95972658335.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/27031717814.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b944bc0626---domofamotenemimod.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d0c0b8c65de32e1c641506498147a8df/89676597220.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210610_6EAC537A84B5DB24.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/47459488508.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7f280f1d3ac941eb0f9a73c23b7fbd10/fubapukasido.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/291005509794.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/7770777325.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23e2b9cac---65451039385.pdfIn PDF document text
    • http://dges.in/userfiles/file/31743085900.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4eb355daa3126d9726579ddc90402972/14058553052.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/63966552339.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/fepulumeloge.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/68428818184.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/8001644885.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/52375428697.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c8470c5bf9731bfa255a34095b2d07cd/vexopexin.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1625196608.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/147200442.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 11572 bytes
SHA-256: 2bfc2609d7a4983ad7ffa83dd18a9272de4300d895ac76fcce41c4725abefe55
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 17068 bytes
SHA-256: 1bbd53003eeec87c5aef81b13fb5996a0f91daca3db2f402c3b93b10d6756c85
font_02_sfnt_off000135d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1