Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc23aed63c69c0f…

MALICIOUS

PDF

105.1 KB Created: 2021-06-29 08:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 121f2098cceac424e8327c1fd8926e44 SHA-1: 6cb7c7ed3724c8649a4ae660e696ccfff6dd875a SHA-256: fbc23aed63c69c0f812a782e76f00245cf6a53ab0accb9a27d49b2a19c8b8333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and a link farm pattern strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://duocmyphamcongty.com/app/webroot/uploads/files/gelinakuwonotapilisuli.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6e56ea3a7c56d63d260758f3dcf33d7f/xavarulesunijezogo.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/jedorelus.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df43397ac---sivuzeduzixij.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de39d5ca43---25968223022.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/66d87ff4bcf7cc5931362aa3a35ef010/pazozuj.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2ldpj6eqgjdqpcf5uianb7nl2h/jivomixamuxileweper.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c016452fc993837b69733c973e0d1459/jokovizaroxopabopam.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/358d33592fbc2aac7e7330936b1aeaa3/91058968572.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b819e82f6f2c42c074ad68f64bded5a9/wujukudozi.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/watafazawo.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/443bb5404f387ed6900784dd216b8ec9/19463059775.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qbanscg21dvbucqi846dlm87d0/dolowelisoroxijufatovero.pdf
    • http://kengosushionlineorder.com/uploads/files/81084601811.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7f1187bfc04c397b47469a0e390d8e0b/25805062361.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f99bd2ea---22111967614.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/wanifupukim.pdf
    • https://africanresearchcenter.com/userfiles/file/76121686911.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4c92030f736b29f53a19995c6d82161f/23752442253.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a9d2ae52e---gesekilu.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f2de8e7c---jexapeje.pdf
    • http://usmleworkout.com/files/file/wolidetinudinojaxutura.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e427aeb9b4bb882e90bf68dd20d79238/83488079499.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6e96b140---givanazinalatafefupovof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=apush+document+analysis+answers
    • http://perfecturology.cafe24.com/upload/editor/imagefile/60903712585.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013847.bin
ff97cb415db7725c82324d80c51c44285be80190e2ced4616f975c652573c000
pdf-font-stream PDF embedded font (sfnt) at offset 0x13847 16668 bytes
font_01_sfnt_off0001638d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1638D 16792 bytes
font_02_sfnt_off00017ba4.bin
ba28925cc32639a1649d17a9798f01ec3c661166911ae360321a858019db6acf
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA4 11060 bytes