Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef8d33400b31857…

MALICIOUS

PDF

83.7 KB Created: 2021-08-10 20:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 286195d063f22c79ca028adf9b3be534 SHA-1: 5b28d8225072faa97cb7f3be1e0cb75fc409a17f SHA-256: 9ef8d33400b31857c25b3fe18787d34b2d4f3dc586d4f9a7ea11d0714a78bd6b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. The presence of multiple distinct hosts and the nature of the URLs suggest a coordinated effort to host and redirect to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://yeosingol.com/FileData/ckfinder/files/20210628_5F44D91D648242E0.pdf In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29ae9b7cbdd7ccef5e4b45201279e73/vesemedusatukax.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/75939165702.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/liviwiwugenujolifekiwu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sozisesolinojugudotexifu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090508c8869c---moxepu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c35e46fcf9318b8f1edcdd76ddc74fe8/62931414432.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/30418214236.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27f1eb275---95627268649.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/fuvapidewaseleruwavakoru.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/18801522900.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fd97df57783c3299ef32c867611d1a8c/96331152939.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/25a0d43cb7db8e6e43a2f0f6d3850afe/jojilibulopigefonifaziguz.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f13e00afce4059604221cb7b0b1c0c97/pigobezidaneka.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff28cf0471fd20c2b44914b2c9eae34a/tovumudonurudilikel.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/fopileji.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/95310083488.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/71019056510.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/bf2d15a8040569b6866a9b32212f00c0/16812829875.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gopel.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/77162123024.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff42ece8e77---54402658318.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85275ab65---kadaxuguvutebifirufuxazi.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/74786231601.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kiq2acm7uppb6jl3pktitf90b4/35158616614.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c463a6edb---rutekokivolob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=funcion+racional+ejercicios+resueltos+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 10820 bytes
SHA-256: af72c60bd7a1ce4744bf44b5f7c0fd04b0b957ddae21878a61d463dfef8695cb
font_02_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 18572 bytes
SHA-256: 2b2b3c7b0c735a1b1463c80bee4c4d35bcd8c34d8b35d81550b5d2fa3a2176e4

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