Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c2f86a2044cd44…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 00:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abe3f9d9fd77621e61d378affd3af432 SHA-1: 5c7eece449b5153e246716a9cc0c4161a23e1fca SHA-256: 98c2f86a2044cd44abd0096baf434a51c30604f11a293b527934de06f911d56b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress sites and disposable hosting, suggesting it is used to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=change+navigation+buttons+android PDF link annotation
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/bumojawujulal.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a2bb8cae89ac9aba1cdb10695a725d7f/21673306995.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/jumuwogigoda.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/70107658178.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408e7c2bd3b---37105125183.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jt1o9t2b299f1rqigltqjukg00/27609927605.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/bumirovegez.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/lomazamaladapozisidax.pdfIn PDF document text
    • http://palami.by/images/file/47840312024.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/64519704875.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/4263395092.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nikisoxerebowup.pdfIn PDF document text
    • https://agermag.ro/mm/file/69969969702.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/mabibazadasoxumilisafimi.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/56750572747.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/pelosavoleforejimadutinu.pdfIn PDF document text
    • http://myphamasia.net/upload/files/33468026273.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/zajexesivinoxak.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/21607325044.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/jumebasigeje.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xakubunelefab.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/zelifoxijeranatuzagi.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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 17956 bytes
SHA-256: 57ff38f542cfc70a1413c2753b8a64512e362eb58807a5f70c02c1e35502d248
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10816 bytes
SHA-256: f991274fdcea39a0d27b66ff2a5955d09f42c40cf0734032c129896c3996bcf9

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