Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a827d75568d4950…

MALICIOUS

PDF

99.1 KB Created: 2021-07-28 09:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d73ae89a16ad1b231222ecd67c05465 SHA-1: fd4b0d45213ab250f8388d4dc733e2e7d035b052 SHA-256: 6a827d75568d4950e82f5abe9c6fc117bc9301b189c1b758bb0b43c025df111c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3e7e7e34b6c83ff8402f0a68fb0e59b2/sifuvuluburex.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/152f87f221ad192ad86aea579d544058/nizedexojubidexelimaniv.pdfIn PDF document text
    • http://redactron.com/userfiles/file/fodawumarevogojo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/90ab273608211249e88ba78be4702101/furaxutuwojopaluvokibezit.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/49d85fdfc51fdb2772e02b549f1b81b0/mofedopurivu.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/27481701075.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/gurajifepit.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e9b1005f---88044146323.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/10479520368.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/scdrh0a16n6p0pdnc8cn86rmp1/13788725315.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/1202870848.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/4l5rnadv45rtv528l7q0hb6sn1/18089173837.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/90626422979.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/luwojojebed.pdfIn PDF document text
    • http://fitviewer.info/files/file/wopuvetofixejupefoki.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/cc7750a08f692134b01f8ef077665855/95411271597.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/dapedudimuduwubex.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/taxipujebezaxobowaxin.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/55545853853.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/gk09e0u9qj6ulbi6on8d4o3tc1/54448924910.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081d84b15d25---xoviguvitura.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210702123640.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aefbf714dbc---83657309363.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/50872248183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=avancemos+3+workbook+answers+page+171PDF link annotation
    • https://mediaget.com/userfiles/files/18513081871.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_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 11120 bytes
SHA-256: 74b2d46face5b77ea9740901019c1773974c4174e9c338affa40ef472992fb00
font_01_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D27 18780 bytes
SHA-256: fd68072c98e6c13ecc6833915d039c8e2e4a3894c82571682a20454e3717d9a5

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