Malicious PDF — malware analysis report

Static analysis result for SHA-256 6434c7d2b25dc906…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de82a82038eba5751eb1c7f604eadf6a SHA-1: c74b3a7b255f590920f0d29eab49621b449129f0 SHA-256: 6434c7d2b25dc906243d364a0ea441e8282a62f065a516133547e010e8e90adf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious payloads or conduct phishing attacks. The primary attack pattern involves luring users to these external sites, potentially exploiting vulnerabilities or tricking them into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bindashnews.com/userfiles/file/deruxujom.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfea1d6ef1---gegujurimojopifi.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/36ac750b1dd8af6d6186d0da7c00ea49/74974162844.pdfIn PDF document text
    • https://pmms-online.com/assets/file/ninufodir.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/metazudizadizaxasej.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ae1a578f---38326786037.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ssfon8n7upb2cfusih2fuqk8a7/88838710843.pdfIn PDF document text
    • https://taperagi.com/contents//files/50200892611.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/48757095391.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/14540918139.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210601171035_760672351.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/83825186252.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/59601193819.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/dojuxaxujajazer.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/88546706499.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3ec088ee81dc35d44a43be172d43f5fe/50496396054.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/56976165551.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e361c459---labubawujagorexake.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/tuwisokepikeven.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ee11be86---pafetofipukowijige.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/3293654111.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12b9eff22---lulezajonobulugivuje.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/lopazudifekiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=alarm+lock+trilogy+dl3500+manualPDF 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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 11128 bytes
SHA-256: 8f30c2917653535d0d3c512ae076aac04a4d8e8720300976994fcd7441f15780
font_02_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 18188 bytes
SHA-256: 586135592b1dc6725972d41a3ba06f86ca9269e3e9632143eb2fde1c84b8c52a

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