Malicious PDF — malware analysis report

Static analysis result for SHA-256 572fbdf39982c27b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 00:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1de61e6d6ca1f79c3c1c097ca1926760 SHA-1: 554c83b215367dd66ef0734fbf7ba84d829d5248 SHA-256: 572fbdf39982c27b0cf9293bc5bd6910c0bd731bc75636c4432615d9b547abd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • 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://coretry.ru/uplcv?utm_term=among+us+play+store+pc PDF link annotation
    • https://ist-lb1.istanajp.com/contents/files/41702917310.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/50458513968.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/98426689880.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/71946819476.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/89858326381.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/39689505434.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xuropize.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/21181484006.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109131923013743.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/zokafemuvitavoz.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/govonijawoxarolixirusi.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/13282486452.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/tepanebara.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/remusunepozifomi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/d6gm9c5ciehcjr7k51qqlps582/24384237706.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/goduwelikikarub.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/lazifoba.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ad7b025e7415791d2f5d03d3620a84d1/jowudokuwuxoka.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1a62fdac1de5d64019ea44ebedf69562/tefip.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/2721946288.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/32930411329.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/72848793218.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/daxajibawupebo.pdfIn PDF document text
    • http://roocenter.ru/upload/file/16273991143.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/sopibefamimal.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/refebuzazidogukesutiza.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109191429322560.pdfIn PDF document text
    • 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_off0000b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 14756 bytes
SHA-256: bbad0577e042926a404cd5d429ab14e8bbfde4e08051a6c512fb021ae92df831
font_02_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10820 bytes
SHA-256: 39d521836b7fdb22bf847a73a33cd3fa7feb3b73e76395b6b07b762ce4a2487a