Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a82da4db388dee8…

MALICIOUS

PDF

82.9 KB Created: 2021-10-19 12:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a11c60941dfacb1ed7c3eb521127049 SHA-1: e701f8b0a8861df3f5c88b5f3dc54807fb31ee8d SHA-256: 7a82da4db388dee806785346b236fc36cc2c00337ea54047ac2466e733d1f828
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The numerous extracted URLs point to compromised websites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=ejemplos+de+locuciones+adverbiales+de+negacion PDF link annotation
    • http://sanraimundo.cl/dyn/uploads/file/67689125258.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/nobezu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615f081913499---17507861577.pdfIn PDF document text
    • https://path.mn/userfiles/files/29748222643.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/73675304237.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kokifevenalolemobebitipe.pdfIn PDF document text
    • http://ginkgokatsugg.com/uploads/files/mafupase.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/tanozuno.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7l9ijaq08bbvnup4mvv6kjp61t/6040847833.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/54104531055.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/jotenomawajopokedetaz.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/79726693465.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/124e7050fc74dab8177ffdf8cd538731/43450924621.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/96205466109.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nebegumesinesujosi.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/xuzefakolazugigugobutedod.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/fuvaxo.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/3967055483.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/85pcvloggsf6behejt9rsifcc4/62688403612.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/nuvod.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16150806d56f8f---28322780788.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/951ece6c13fb31f01a3e9d9fcbe891f5/21556348697.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/56483165117.pdfIn PDF document text
    • http://salwex.hu/file/93588579134.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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 11180 bytes
SHA-256: 5530610f0a2969f2681b45ef40451f51c0e70ef894a4232eb3e7c9d4733c4fbd
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 20312 bytes
SHA-256: 302312174cee06820faa9fa62c6c310a8269a26293696d21875fcc6fa37d5037

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