Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b61a08beb53609…

MALICIOUS

PDF

73.9 KB Created: 2021-07-15 22:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f30ce945c3d1fe234647b69a8e698b79 SHA-1: 801518f217938e822f57f25480f8b98572f5eeab SHA-256: 43b61a08beb53609342073e414906ccc8904ce473b606d59a52a98db70711aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. No scripts were extracted, but the presence of external URIs and compromised CMS uploads suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=game+ppsspp+dynasty+warrior PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad99f6d520---48499819029.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b60anh8qul4cnl3t8bdtn7bjfr/sazozufekefur.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd598f501---xebetolasivos.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/wisetobobidowekerulawox.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/39019698527.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086813e25c7e---dexafosop.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/75320877563.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vipevigotajaserepobebotu.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/zigetataweb.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ab08653b---18693928357.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e2c038a18ab67140f3328c956d2857a/zelabaneropuze.pdfIn PDF document text
    • http://grimastone.ru/files/kumiletebanatekebix.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b736457d748---javutegokelejajukefuv.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/dudiwizakukoseni.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/51569992371.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/19894643758.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc87b3d7844---supanawididemezujanumex.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/20143901638.pdfIn PDF document text
    • http://learningkey.org/userfiles/janijidolimekinabilipewe.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xoboleloxirelowo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ef2883eccfc4689d79bbba5ae152fa96/45197209223.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a008020896f---17212693678.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815cf2bd723---wijozizetosapilanuwuw.pdfIn PDF document text
    • 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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 16684 bytes
SHA-256: c885c49dc1997abc628d5d46cd4d214e3a8f6a691032e5d0b9750d69633aaa7c
font_02_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10748 bytes
SHA-256: 5a1052423e1c2544fce8fa1a038e8abee38d6a46b4a33c3c013eac9f49e11f1c