Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c43e659d041e90f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 07:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1130a2b78428552e66ee394ba3b0886c SHA-1: f2b5320e8d8a289c3deafc071ba4c26332abbdfd SHA-256: 7c43e659d041e90f9d8159b089bd1c4111d07ed9d85f29acd71d4ba00eae45f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://guide-eq.com/userfiles/file/20210908161107_mz25j6.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082cd78d76---36801122826.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nosanimuwirelori.pdfIn PDF document text
    • http://www.centralperdana.com/file/45578171261.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/89067802478.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/33409404296.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/73508326344.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/vujipadamigut.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nmp37atn0iafeprhb34iod6253/34928430506.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80617814754.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/14160909802.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/jasibebixumafipilufozipur.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/91462975155.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/35204023345.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614155c3192ea---85523968703.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/muvizireneluse.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/66075756500.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/xipupogidav.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/16580783304.pdfIn PDF document text
    • http://eva.am/files/7f8a51c3553e16a3.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/91916668229.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/97008301607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+apk+awardsPDF 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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 17756 bytes
SHA-256: 6eb64d3c65a9f3f39fa97d6c2e7ef8e56b46a08c8be33031c2c1f8f9842dfe00
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10620 bytes
SHA-256: 7487e411d1db4e5cdc7a73c1007ff0007e256f5539a989a12c8fdaacf18fe0e7