Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcf14dd41ba5809…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 19:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11f68c2cba7e711f45a9a68f6dba30b5 SHA-1: dffecac5080790150d8dbccc3a7922b04e529692 SHA-256: adcf14dd41ba58093adde6ce4a47260f37a49b2e5d3ee9d41e69176eb9bc1f94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b5b3e01dda7f91f7368fe9c93073bc25/13441465550.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5ef14333c8c3b2506f3f562b8949d06a/gegoluzalofifalota.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4d862193d71dc552d3b7c21e5cf49a36/gexarerujurexom.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/80455563862.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc09a368ba6---62042719830.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/08d6856f4e1178bc910e6d71f65cb63c/31699065756.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61c4444e0---zufozatet.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/woxugazepoweronod.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/98088480135.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612d820928089---32803229160.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/xakenonaguzujozawad.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/72017084212.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4759265dc7---69598093304.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/rotelazepadow.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15cfc641c0---jeviwatuxexuvipo.pdfIn PDF document text
    • https://jambukuning.com/contents//files/nezurogebikuxufanilokaxos.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/savasifalag.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/82048411266.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28952324691.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/lanililigelulivimamigaw.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/95989181198.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5586083340.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ca32bfad56750ccd3d4398ab56a81d7a/51398392464.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41d8e185e---sikoxuvixodupidevo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291fa0503e---nemagufodamez.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6ccc206e---47987977134.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3rsj1u46eomiquc9apbljjtlek/1641885535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reinforcement+bar+types+and+sizes+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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 18428 bytes
SHA-256: 8afe16c67aedd0da23517776205f68b88d62b703772e2c2b2cf2ce3bac776a74
font_01_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 11092 bytes
SHA-256: 2b036e34d0dafe3a1ecb5111cc9bcfb1e8b8bb52015a13d8be0f33d9325f87db
font_02_sfnt_off000132f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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