Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e5c00c04b5b31…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 16:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ce2fd1506707273a022e9d2b8d9bc0e SHA-1: 9b7f7b467b4237a9166be67f48d8e7626aeb9fb4 SHA-256: 5b9e5c00c04b5b311d674943971229306b947de92b7f29267ed8de2f60d68806
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46ae74371---52915241885.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e688d47bdac---simis.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/rudejapadilojefezose.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16273774805011.pdfIn PDF document text
    • http://packturf.fr/files/76812465115.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/92007307973.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/xeporirenoveropa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/82978d9b61756c1ddd565f6bbed22218/76121255506.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/bapakamagateluvogokeja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e472895ee---9174608240.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/82906953470.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/ruvuwegositas.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4918699e6---jinudax.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tajofuri.pdfIn PDF document text
    • http://allasclub.com/campannas/file/8837596635.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/zenatizebatezibori.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/93921337052.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/pafozut.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/govajetevemedelo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/dakirobebawam.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/wolejapi.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/79894728029.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/716cc76fd4bdb2f7ee813d0071c46dcb/24571482524.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/farajip.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177cc8d544---dosivekowadasanixilodo.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/lamedajulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+story+of+patriarchs+and+prophets+pdfPDF link annotation
    • 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_off0000c0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CC 16176 bytes
SHA-256: ec05723d579f19768badb418a7f4ffcfafd459fafd5d646db0b399eec524510d
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10748 bytes
SHA-256: 81509cf0318ea0362eb2f946bdac66560356220c8c742af183c3fe6b02aa274a