Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92ef1eaa168503c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 18:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee4b705eba8d45f4da7430788961859e SHA-1: 93c3424c3b405ada30f1c217b2e7963927dfc2ed SHA-256: f92ef1eaa168503c4863b79fe1c6f5cf320e874269899e046e769fcbdf5cf64e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dalaichau.com/files/60254407111.pdf In PDF document text
    • http://hiniceshine.com/upload/87831487590.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/83872678570.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140681ce11a5---maposugixixirofojigifo.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/49120574335.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/698eghsj0ml837k99cpuh1svqk/696525463.pdfIn PDF document text
    • http://shahgrp.com/uploads/foxoxabegopag.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/fekesuvovosuwak.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/45181087001.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/88496514596.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/dakabalasuwibaj.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zumuvunugonezekoritileb.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vojowawewitis.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/zusagibiwake.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33536fe9a---10755881239.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/189bvehqgv0tnt86i7kepvr121/23024744347.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/94590673733.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/rowovowesijelamizokoka.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/luvosunir.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632198344d4nv.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eac04747f---48519126188.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210921_212552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+tv+media+player+appPDF 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_off0000b040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC852 17340 bytes
SHA-256: 8fe7c761ed9e06a27712ed99c17bb5ccfc9eef88e365212c9c158124f87ec49e
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 10548 bytes
SHA-256: b516756818339a9cb3ba7a8cc3e552f1b68ae8040bf32ff742da8300c6ab7bcc

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