Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4be6c6daa9f246…

MALICIOUS

PDF

88.1 KB Created: 2021-09-12 16:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e72ef0e2cc58cb0a9f936bdde096f6d2 SHA-1: 2eaf24b7e518e790696930fde60d2a93975497ff SHA-256: 3f4be6c6daa9f246b2b1d515ffa7e0ddac39a55a51817bab42375a1f3e3da444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thefertilizerequipment.com/d/files/18271795850.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xakobosirogi.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wixivijumetotisuli.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/83996940835.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31065217724.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ecf17a5d77e58543c3a536c148f6867d/40546731549.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/xurajat.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc0012a5c---23909285234.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/dilufiketubuvumi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380d469b304---53049193037.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/xavidazixume.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce26e9c24---38838999883.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/14612929197.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xiwisuxesiki.pdfIn PDF document text
    • http://screen.by/images/file/fogolima.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99736067465.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/saxifofipirazafuvotalomur.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/zuxujasajujuwalosak.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/11454177149.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/8243991455.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/70775576446.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/13aa142cb39c9808678d06e7d80999b4/18500218576.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/tuberitivapavos.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/43205371676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dr+wolf+chess+freePDF 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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 20232 bytes
SHA-256: 3c6fa265b4fd4be3ddcea734bd6fe2f50f9f2bf3b830e75a8e057ceebbb40b17
font_01_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 10064 bytes
SHA-256: 8fecf96975b19673589d15d562a8fc33771fa1fdd07f80389b76b9d9e7e0c9f7
font_02_sfnt_off00013b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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