Malicious PDF — malware analysis report

Static analysis result for SHA-256 3805eaf78e068c07…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 07:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 103ac631fca9a6c0c7f72bc66834eaef SHA-1: e8f131e55654e2b72422efbfb924792f6f3d83d9 SHA-256: 3805eaf78e068c07337c4a00631db27f3b1a98cdc130b53f56647e9eb26acc7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c87210868---zasozuwud.pdf In PDF document text
    • http://wpchkg.com/upload/image/file/nojowuwewibiduwafokumiv.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075e98e1c609---gejazopewomiwajubuzuga.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/wiwup.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/0044435f987c24b13baf8222a19a3681/nejinanorowifusa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9bqb75kttv7da9il0ddro6tasr/32715028549.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a0d25b93---koxekoj.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • https://jetaime-shop.com/files/naxezis.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/58334966644.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/fajuzotufovikodelotipu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d288da649ad---jaruxuteka.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/84266189881.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/52089763264.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/760f6814134d2dc7ae286375de6e803a/4880130033.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/4458307384.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nobezawixu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bee50d0d7e26be51e5de8ccf238830e6/97876079740.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mamemivezax.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tobobafira.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/75218439430.pdfIn PDF document text
    • https://pindimana.in/uploads/file/pimonidabezir.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/40754756515.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/16079179358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=organic+chemistry+book+by+bs+bahl+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA3 16988 bytes
SHA-256: bf2594c8f4a3f7601fa7186de74f614c0cd39ef241271eb8e832a11d5304567f
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 11440 bytes
SHA-256: 4159ab690c628ba456a5c44c2ce2fb178646d60d123e2c23d84819bb5fe9e10e
font_02_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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