Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ad9c56bee1c150…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 18:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5eff9c3af27083a4fad2fb7de0508ac6 SHA-1: 3f49b9528dbe211451edf118e1ca7f9857f40eb9 SHA-256: 74ad9c56bee1c1506009f8f1b244b6ff4e744cea4f7f46bec238d06838033a05
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards users being directed to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=celular+samsung+galaxy+s5+paraguai PDF link annotation
    • http://hydrem.ru/images/file/tipaso.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/38223911873.pdfIn PDF document text
    • https://combrooncom.com/contents/files/vefomujetisufejulorowinim.pdfIn PDF document text
    • https://irrisyst.eu/files/file/7515349223.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/70031029658.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/veziwiwibekovafa.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/23135669980.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/93461080600.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161475e0d7ed2c---wugiravu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/92dc2feef269269f42d76dba45342417/tenevigajew.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/61689902120.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/videsiv.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/bureri.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/27224110273.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/puvadi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4a847020c---petajuto.pdfIn PDF document text
    • https://durimawar.com/contents/files/wikofagojelabom.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/98761597815.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/kolumekez.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/tugibijanil.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/19040990454.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161539cdbc9537---zaxomuzefuzokukumi.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/15544329053.pdfIn PDF document text
    • https://iword.de/userfiles/file/5125959081.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/74981752851.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_off0000b27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 10856 bytes
SHA-256: b0b25c9ddd01746ed88ed03ced62b9807b38800602955d8c428d6bc0b88384a6
font_02_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 16756 bytes
SHA-256: 7034374ab54cca81dd803714e319c2aaae62433c4ba2975193c688fda5bfe587

Open this report in the interactive analyzer, or submit your own file for analysis.