Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c8c1df45efd09e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 18:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a00eff823d279684b146830700a7ee28 SHA-1: 81e63e80a4eef85b8ec265eb2072147ec7c15060 SHA-256: a6c8c1df45efd09eaec779cb25aa2cd998722001c14c3ab2bac9e82f0ad95ae0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links point to compromised WordPress sites and are part of a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=every+henry+stickman+game PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327db3f1bf7---82140695257.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f976f2cc5b---76864824428.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/72631061406.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/84319170367.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81899754642.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/68963288095.pdfIn PDF document text
    • http://k1a.ru/images/files/file/61713582018.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e78bd49a---fopajoka.pdfIn PDF document text
    • https://robodom.si/files_vsebine/78471286016.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xikujuwotawarasuvavita.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sodopuzip.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/vuporevedabixebalu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dbaa993b3---32811076642.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/gonoz.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/63337420422.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109121454029811.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/zarugedi.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/torajunasebu.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/86976713377.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/41533185852.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/90216611592.pdfIn PDF document text
    • http://axwelindia.com/uploads/kunuzojewopokevu.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/dowirinapivekekujonif.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_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10764 bytes
SHA-256: 6aa3e23b027db6db81aadc0e693c186132cc901b3ff9eb7962745f0f9c3ff5a1
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 17100 bytes
SHA-256: 8bbcb36283a3d9b8443d45faad6f11c338043cdacdd43fc70a94e34e4e6b6f42
font_02_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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