Malicious PDF — malware analysis report

Static analysis result for SHA-256 e666903c3ccedb49…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 03:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7a6c4cbcd374e3b78b02f31ff4a4cc9 SHA-1: 34f1d1fc21533c86a52305029b146558da9c4b84 SHA-256: e666903c3ccedb4930c2c8c16afd87e7601a3517717fa2394ffdd41e9a1bb852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential malicious scripting capabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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 http://globalcenterhotels.com/bot/ckfinder/uf/files/gufekiraliripa.pdf In PDF document text
    • http://princeton1959.com/clients/863834/File/xibomisesuni.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ea21903b---texurosotulugelujir.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c564f4239---rumerizukuwituviburilam.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161255452f374a---92585722120.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5baaf4ea51babbcab4eb7496c9c6ef41/rokezifevor.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f7e1d4a2---81501100523.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4687812c---59792936554.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/agdukomk7qq528crukms188915/kasewenubeteroxamiduxod.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c06998528---fobosomokakori.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/bexawubu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/17782259500.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/gigoremo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ngpftr89niri2ocaa30ccdssm5/85972991320.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/68800842345.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/fexesetago.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102e77467de9---74869111673.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/84266189881.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2d725e367---samufijozakosakudowazu.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/ruzamixokitur.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/62942752243.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-2/20210502234133634452.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dac264c6f7b81081f3484f3ea007dedd/mifuxagajuniviji.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/zoteraxepexupoledaku.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610377c2ebd54---65434387442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fur+elise+easy+piano+sheet+music+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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 11076 bytes
SHA-256: b909e8bbc57069c33c91a2bd4be17d65716684c84268db8c92f5c2043a03375a
font_02_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 17600 bytes
SHA-256: a09879f9eb7fc5ae1504ba1da4605ccfd54783274868c00c59d7e3e7044f0ab2