Malicious PDF — malware analysis report

Static analysis result for SHA-256 c048128b980665e1…

MALICIOUS

PDF

74.5 KB Created: 2021-06-23 09:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4e2d83bf2c2a7a5d578b5cc86b08b102 SHA-1: d67bc7dcdfca662b2d23815327d6a1cd24f83afa SHA-256: c048128b980665e10fc3bb184c4ba20cc4d222c933f4c9007e6ed0bbb72ff4a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, appears to be a lure related to 'std 12 commerce english grammar pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e12a8b479---bubanukorapuso.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa839dd3ac---dumumona.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/xerapiduzelogojakud.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/j7to1og6i3stuo88t6klbq7scb/93496226236.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d3524d810---xelutovusojuwumepoje.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/68743374648.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/baxilusofegegovitabo.pdfIn PDF document text
    • https://go2germany.ru/files/file/turogimijokegofilefusix.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/t2cd18n8fdsm0he1cjencoj0j6/mamurulekejojajovujafurut.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/mubepegasemupujoto.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qlqstsgve3c8cua76r0nd4tugv/firanuzuna.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a031cd6dc3db642fea7ff16dbd12ce62/tidunetufarobeluwijiwaxe.pdfIn PDF document text
    • http://digifast.cz/userfiles/kufirojisogejadokorozos.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xupanolurolusijubofoni.pdfIn PDF document text
    • http://sun-eko.eu/files/file/saxolekozemivigokakag.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4d598d0c---ponewaf.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/006aa25dcabb75cb770f1ac930f7f1f4/zunemixuwofoduzopizixu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/91330147585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=std+12+commerce+english+grammar+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 5856 bytes
SHA-256: 8434bfd752d5efd335ed885255229d7e88aa0772bbfabb85d265d0420811cbbe
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10708 bytes
SHA-256: 8572e9d17a1657ed4dcffb1011c43855dd172befb2837fd3fe86162114cac780