Malicious PDF — malware analysis report

Static analysis result for SHA-256 add34be4940f8d2d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 20:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2cbdf6229f0c477543ae3035562aed3d SHA-1: 6b7a4979985141b19ee77544ec04b18bc844aa5c SHA-256: add34be4940f8d2d46c190654c40b4db8a838acbd446e2c12e677edf27789a76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The presence of these elements, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely serves to redirect the user or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hurtowniagrafit.pl/userfiles/file/84253162810.pdf In PDF document text
    • http://olech-rzeszow.pl/userfiles/file/54799903824.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/47710288342.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/28743999393.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76d266b7e---17871672165.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/mafal.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508ebd12972---62310454036.pdfIn PDF document text
    • http://elskenecologie.nl/files/zixerifopuwaxudotaji.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/bejuze.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210911_26933BFA6786829D.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gugokurodojejonafuxebi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/besepujikifafate.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dir80scpo561ls4gci7vvqfmm7/10833666343.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/90886917248.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/lavudasotowego.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/39936430801.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210926155313139.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/29215737362.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/19550927157.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/moboluvedezikaxome.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/36916455897.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/4760696560.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/52525406946.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/badudotaravodosebuguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+shakespeare+stealer+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_off0000b2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 17096 bytes
SHA-256: cd88c38a814902ee7f81b8aae1ff491aa871dc5d6356ab6c78754455e690a59d
font_01_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 10336 bytes
SHA-256: 76046b681b8a5109eb93772d489c3044b003c4d3eb7833d10a4d57e1edc37df9
font_02_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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