Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a84498554764f1…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 05:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a146d0476d7f24628b494db044a06bb6 SHA-1: 160ad2578a8c5cec77b7828e8f7ef64667ce80d9 SHA-256: 24a84498554764f1eabffc094ae10f3fba4e771b68192bbcab9b571e0cf06c94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan delivery. The presence of multiple links to compromised CMS upload directories reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795001a9054---pajinufi.pdf In PDF document text
    • http://vagtteam.dk/userfiles/Files/bedirijitader.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/a255gmkel5ags1pkrgnj0q91gu/51022089547.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/moziguzujapomumepekom.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/lamuvebukomowaxera.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072af8f46c45---zutamepopuxekira.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93b7d79a4---84796654645.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093adeb5ebd7---vavokeziravaxidekob.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a113105c720f7fac5fc79758f33497c2/94499297508.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/48946213319.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/dae08f75ae5a4923178eb852ef437356/komujusinedug.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/kawijixotukaved.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/60159320480.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/86912345646.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/61319286775.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/73643394932.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/duwedoralewetutovak.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6edfcd834---gorogapiridazobod.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/444ure4aldjajpm1sfu97eo5qa/80701210606.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/nogovasikixesefa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ckm3k3hmlu4ptc4n6jl0gosm0/70963851551.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/73874388878.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/140dmq9uutlte7q7q74ma5mepm/62392251781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=grand+gangster+miami+city+auto+theft+downloadPDF 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_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 11260 bytes
SHA-256: f404f81bcf3075d68e79a127924d2b5245b700a2339ab37442d1c8cb32f1f80c
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 17248 bytes
SHA-256: a814e4152274bd1cb60554224740b098ac384b86d88917112b2881053cf43f99
font_02_sfnt_off000136c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1