Malicious PDF — malware analysis report

Static analysis result for SHA-256 4796b4bc6e3f9ff6…

MALICIOUS

PDF

92.9 KB Created: 2021-07-21 13:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09367e6e8aef40e48f40eb7ec99660ad SHA-1: 1ed987ad7557d6b90fe054cada7eb876764a0c33 SHA-256: 4796b4bc6e3f9ff686332e08ae89cd63a9243ff4bf5ed372431c9a94a16ace22
104 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. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 http://www.jacenter.org/js/ckfinder/userfiles/files/xexegusafamevipikuva.pdf In PDF document text
    • http://texmet.pl/userimages/file/5640935103.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/99525116503.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609549ab7063f---85634738124.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/58e25b18cb8c2c031ec7c1285a8a2b41/70208100540.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/7ddcca2ffa728d382f30a04b03fab3bc/80511221942.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/2466993155.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//danizozipexuxop.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/jirixeboviropajiwufina.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/66590307031.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/87082652661.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ae24i0nl992j13pl79gi2bl46k/78240848184.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/17053013450.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607920351795e---fadukiwuxudafaketova.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e2a90e6fb15c9a48917cc79923c58e64/70047218343.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/32195989196.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/seganopu.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/niwagaku.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3406d9709---logizo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vogitifodoxelusiworogibid.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t75gfkjdtbtgbf3kl3t9f284ri/jelunukolesivorolenegugu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/slo15l1bkrvl440ul06iv981e3/50182257258.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-8/20210608051301412020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2021+march+madnessPDF 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_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10476 bytes
SHA-256: ee05db7d97e1c003d20e6b1c8f6182d72b5582761692b113e78ee42be54c06ec
font_01_sfnt_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 17412 bytes
SHA-256: b8c39cdb43dec59d080bf7d822923bcaa2a3608f27465802cade843d2856d600
font_02_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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