Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f1eed0a0905237…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 03:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6654e9680fed37071741a863fef58fb SHA-1: 73fd8e08099a0426bf38eb9d247250f8f11e0ee1 SHA-256: 49f1eed0a09052379909cbe7cd6a69fce83765e12d6f6b3d0f5865b135115c97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://madmojo.com/fckupload/file/97095500469.pdf In PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/70124570120.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8120bc0583a432653d62a788a05122d9/petuf.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/tikazatozagewilo.pdfIn PDF document text
    • http://metallpress.ru/files/17548490282.pdfIn PDF document text
    • http://foodchemsino.com/d/files/vejijufekedimuxazo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fbc2d2b221de19591e7c65ba3700f0f8/benimukazetowuwepupo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/41380376150.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/be3fc1808089f0729c2a9ee42188768d/96611608351.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tvuhr12kj2d04e26534ud4cv71/41414402817.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/vadijapewa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d195ab22---jimuvidujab.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/b7imk41m9kvi2ii5mgl9vc24se/pikizokifala.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/mezolos.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/62197b7f919f600df4dc7593edefb3e1/bugidegunozapupedejuw.pdfIn PDF document text
    • http://hasyo.net/files/file/regikoseriba.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/siwogewit.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/96762749506.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nvpa70otf6864unur42l95lgf3/tunobeso.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/90400281311.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/5706938151.pdfIn PDF document text
    • http://th-hl.com///upload/files/37091929670.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/668g3mk3elpsqev4srn42ros15/85412462461.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/govaxajirobojenebaxivevoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=find+slope+from+a+pair+of+points+worksheetPDF 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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 10916 bytes
SHA-256: b29b08cde5def3ae98fd16319c775573a3cfb7f7142b6b84be537d55f9ae5746
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 17952 bytes
SHA-256: 936b75058eadab110953e3560f5bafe3eb4008fa6a012b046dfdd3ac950e1776
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1