Malicious PDF — malware analysis report

Static analysis result for SHA-256 b119778d3b20663c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 05:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25692d4e7326e73418aadcb2a217c557 SHA-1: 38c76a05a4bd30bbe9c3a345df41d62389ac3b4a SHA-256: b119778d3b20663c70cf97ef55efe49a1e0d7482fcc0e972e7975474cc873371
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=fishing+clash+hack+apk+2021 PDF link annotation
    • http://vita24h.com/uploads/userfiles/file/12011433150.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/jotilijatafiwapogatume.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210908_093826.pdfIn PDF document text
    • http://abnicum.com/files/file/dumut.pdfIn PDF document text
    • http://kohaz.hu/files/file/43227117101.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/27995874784.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/58484013216.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/80632417429.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/86793374956.pdfIn PDF document text
    • http://anpo.vn/upload/files/gilamatajofikiridi.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/47949591257.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff67c18a90---fudidadiwemoker.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d2a2cfe6---43237405191.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130443255875---49307743677.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/65042854624.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/pirugikepuneladase.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/vuforigizud.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210905033210760068369md.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/kudezu.pdfIn PDF document text
    • http://vaynhe.com/upload/files/63365686298.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/vemolesolezasobufejuxiwi.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/56422117153.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/92584840019.pdfIn PDF document text
    • https://go2germany.ru/files/file/16564403217.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/pezuni.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/60139106687.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://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_off0000b6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BA 10568 bytes
SHA-256: 28f8897bf1addf941ec80d0e825eeaf4987bb642b80e98e05707fef5b5ac5d12
font_01_sfnt_off0000cec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 17540 bytes
SHA-256: 2a9b9d0dd7b13141c2002d82e8a2579a35b77530662bf2c7b28e706b21d07d82
font_02_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1