Malicious PDF — malware analysis report

Static analysis result for SHA-256 8049833e028aab76…

MALICIOUS

PDF

97.4 KB Created: 2021-07-25 23:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 079bcdc267235c38337b06fd6e77b3b9 SHA-1: 7215bd9c40f6eed7266ec1fd557493c062d9d3cd SHA-256: 8049833e028aab760bd00532d6211f9fc8d8c58f95a47c99fe856a4f2129644f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific content or intent beyond the observed link farm and download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/accc36daf4bb1a21a1038c86534f0a5d/30291669580.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4fa52d789bf588f24ffaa04d61a343df/11710863259.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379a233032---92037383567.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7eb7e598644324248327ac91252ed9db/tizidapepipepuzuzuloxe.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5e57e66781562251e8be544d66e41f1a/14440337947.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/64865408193.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4841372e12---20297861085.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96ee0c90a---bevojimijase.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/temunurozafalotuxiwaza.pdfIn PDF document text
    • http://samtle.net/ckupload/files/39696658725.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e610345ede---bapokuforafozimalejidi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/419481309d56ee776109f3cdb019797a/tizekixofegelifazisa.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/sofalalizevesasupafuza.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6f9308ef9---lanirule.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/90529436142.pdfIn PDF document text
    • http://poiskvod.ru/images/file/47620006498.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/zikezikureja.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210605_678A0E61A29C7809.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/vebofibidesupalodaxitoju.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/27908190035.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/67644715042.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0d7961f656962b64805aba32ff2c1afa/wezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=avancemos+2+unidad+8+leccion+1+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 11252 bytes
SHA-256: be7ba0bbf32fafb1adf1c76327323b08f27189d479760c8ca88419950b1bf92d
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14284 19344 bytes
SHA-256: e5a99dee9149a38fdf64e5b2c8c56d6974c116f1c9d9bf8e6fc7b5a40b78e845

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