Malicious PDF — malware analysis report

Static analysis result for SHA-256 989fb1cd0a5d6855…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 13:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43c51fe04b369553cc24a087b9b40a6a SHA-1: 332c6901210a51ae023f039ec9b988dde5502bd0 SHA-256: 989fb1cd0a5d6855ca74777540a256f2e9b7979177de4b29dee27ad8a7cdab59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://mysilo.com/upload/ckfinder/files/panixizizosula.pdf In PDF document text
    • http://shiinamotors.com/js/upload/files/44142825977.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tobalefoninenoj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608661f5c5d4b---67432315954.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/duvolidubitetida.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/78334426842.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b8f99c59---79456736156.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/birape.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/739u2uq8hc76fg2iblaeo98bl4/wadevodajeposijovisener.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/72657092506.pdfIn PDF document text
    • http://cga82.com/admin/File/gepuguxunexisizipofedo.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/72709263157.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/nupisufolajitupe.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/komazogamobowodazokud.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b981c566---79504242362.pdfIn PDF document text
    • http://apcmagon.com/userfiles/ziselapufatitezifexal.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1c7ca97d---gozuxibazam.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/ranibur.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/48455959089.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/sorit.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/89d07b51dd809ca885eb1a5674bb4bd1/kazigulovomijipe.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/wuvaniwipurigoteburobibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=circuit+breaker+mitsubishi+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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 15988 bytes
SHA-256: 0b7aed87907276dae2c801aeb693c67d52ec81b1fa1a081d900297ca8d8bba43
font_01_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10980 bytes
SHA-256: 2d994b244b11ce809446d22d8717243295b48a2632dfd00825517b22ce8c5142

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