Malicious PDF — malware analysis report

Static analysis result for SHA-256 c553c743f989b266…

MALICIOUS

PDF

95.4 KB Created: 2021-09-20 16:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4293112aa28a324e1ddf891471aab83f SHA-1: d546304acb91feb445f4c48d49a3c0343ec633e8 SHA-256: c553c743f989b26613ff9820d09dd6c4d31cf3a8e06476e6026563928a1eb707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161458cdcadcc6---57294583264.pdf In PDF document text
    • http://szjwwj.com/userfiles/file///13730515990.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/31684519403.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/mukir.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b0d84e23---limusozenumorawulawiwukeb.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/navano.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/95107938798.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/6354620900.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d2fe551c---tulamamipuw.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c2ec9865---46185203435.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/30439036327.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/peder.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/wubotuwitoned.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/resezibixit.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/gozemamoravuluwovama.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb87b5eef3---zusuwe.pdfIn PDF document text
    • http://banquat.com/userfiles/files/60061355221.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zezowenivo.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/nemuwesibaposinokod.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/vulikesezazap.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/liwomivilenonanebifewu.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/34633017296.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/20849175843.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/rudabugugitodikonekosoxej.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/19840992748.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/bukunesiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mi+9+lite+pixel+experiencePDF 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_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 21684 bytes
SHA-256: d9c9cbc9fa0e91a1e6922205dd9260273ca4b32960c6a19d2248ac7f52620562
font_01_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15900 10180 bytes
SHA-256: 4bf8eddae4959ac99488995d75c92a43c9d116c4210372fd4cec60ac121bf96a

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