Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4901695430928f…

MALICIOUS

PDF

83.8 KB Created: 2021-07-15 12:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b75e2d603324efa7681fe0a2524db5c2 SHA-1: 150ce10f928b0a9e5951ac360138a2be19201297 SHA-256: 7d4901695430928fb2cff7bb9c7dce8cb125d146c14fdac5ed278032453dd738
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the link farm structure suggests an attempt to obscure the ultimate destination or host malicious content. The presence of compromised CMS upload links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24cc28b471---68095668219.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee71b0f87a---96792291106.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/pewukerelatunupulinow.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/38761659811.pdfIn PDF document text
    • https://tonitomov.com/picture/file/basanabonibitabasidoganan.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430103201164.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609158c46deb7---58764993841.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/57615750260.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/wumurozuwokisigazonegubif.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/42400672726.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/79298901284.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vijerot.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/tenot.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2665d2f368ba1b244b2cf2d595722103/lurasosoro.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/64431577589.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fbc79ea045cbc3202397c17577dd160c/3211943014.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a6c7539edb4bda506d1234485413770e/mawemakonin.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16078b201e7c0b---4213461039.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ad2792f9dacdc358d62b1b50d80eaad1/15600209908.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5df61bdd---bijojelufo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/satepilisomimageka.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2cc03a027f61b4f9bfeea1cb289ff82c/ginonesubalutikiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=3+months+baby+loose+motion+treatmentPDF 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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 15932 bytes
SHA-256: 48df01253370b5cb0aa8e4cf572e3bacad80e5858e60c6304ef2cafda2c7abcc
font_01_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10704 bytes
SHA-256: 564ad6a76359c85030c22facf2d1278d1f486d38e7cf42b0510f2597662c6d09
font_02_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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