Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5623b7fee94962c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 21:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2feecd3dfc02183baea15890a70829c9 SHA-1: 746603b8df9fc37c584e452e1db824d9932ce78a SHA-256: d5623b7fee94962c55fa50f8336166f4267c2e7c569e4a365625bd107e4d9531
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=mod+apk+bike+race+free PDF link annotation
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/xofufazufideduxezal.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/4259563300.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/sawitovalivivivasuvotu.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/632576864.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/wujatumejetal.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132121ad33f6---81645759285.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/gelumepa.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/5913068431.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p37cso9b530d0bfnc8v0dqu8e/zonilerorire.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/54827072256.pdfIn PDF document text
    • http://raczcsalad.hu/files/18204177836.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43fd5b370---35514430215.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333dd10b628---jerebefaraminaseru.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/71136158266.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/31167744979.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/ragixekogumijeja.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/74770957514.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613419656ad64---lizelogepesoladijenobode.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dituzemapogipevudir.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649655965f---jisamejanifisepidi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/79915350156.pdfIn PDF document text
    • http://erpos.sk/data/files/80649577159.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/tidaxazu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/90005941812.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2566575---97720777000.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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 17472 bytes
SHA-256: 13cb6bb65fb66f68f66d48d4081166ab152e3876f8362e0e49d70de2ef5d6cd3
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10424 bytes
SHA-256: adc80bef49a8cd3fe7685178d58b304fc89ab3937c593399ca320a4d167f6796
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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