Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6c8ed9b0ddc46…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 05:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52a1aca57ee5336b655b3a039cdae6d9 SHA-1: aebe0ff761feb258ae7edb5631ca7738f7f6cc74 SHA-256: d1a6c8ed9b0ddc46ff3c3518813585e13a7df07e469c5a774a97ee88a548d990
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised WordPress sites and other unknown domains. The primary goal appears to be luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8e49c725---81791596147.pdf In PDF document text
    • http://stavclearing.ru/upload/files/risoraxelusit.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118e65931a74---18506231734.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/datizob.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/9feb75b00a45959e078488c4742d13dd/640422561.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/74718121702.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/26202261002.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/357474624.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zikofegulenejezupumuvu.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/filupaworuvexubikisunegi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6884a47b4e09d262db3b53a7fd194eda/99088649190.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/13742631269.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gifab.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84752676631.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/zivero.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/sidixoweseko.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/69139373916.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/65543722391.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b9730a72---69074192414.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rirewovamikixevegilo.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76940705182.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/gelena.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/ritozebulal.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becfb8572e8---77603733829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=inflammation+of+the+eardrum+medical+termPDF link annotation
    • 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_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 17384 bytes
SHA-256: 2ebb64781bfa69ef46ff601b45d5852377039ebbc080e390dc4098b4fa66b118
font_02_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 10624 bytes
SHA-256: 1f9c5546d43c03d3eeaff39cdc4d6d8ccfb7c9150078a90398c06c43e0078095

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