Malicious PDF — malware analysis report

Static analysis result for SHA-256 2567c618e6b3f045…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 17:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ff385b39540b49a4c66c376d29b5dd2 SHA-1: 7d3384fc9d4d645e7df3c01e0ea16e9d8e5c45f7 SHA-256: 2567c618e6b3f045544434a02732338e039c2ebe6f166fc0332704fe32064a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://hardlineconstruct.ro/app/webroot/files/userfiles/files/lagasexedisebuwul.pdf In PDF document text
    • https://wildnaturetravel.com/File/debexopiver.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/87101324736.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/kogiviwoxiluxumo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/4an8oh12h1d3i72v8taa0scogm/96665507893.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fc93ce92b00c2c2a68bcc9b3e86d4e4d/remeliv.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d395894b4---95632041407.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/sazekaxuxuzowira.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d83ec389696c3f6eaf7251385792bcd/xunoxaturekebiwe.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b5f7adb5d20f32f1386a9862c0f3429c/89521163507.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d4d75ac88e219122eca015e7e30d1b60/77949702098.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/jixesebikusaxorof.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/g8lpedg88bq5aosdnkuad6jo7j/gugifa.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b681f9d4abb---nagijegilet.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/pesuxategawilegok.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/17759642814.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/075ef9942662e07b7a20062229be0064/dugevo.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/sapapetifasunijuvap.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/mowumab.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/201901d0eb1dbff48a93d2e43dcf52e9/26660512072.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cbd1ad4ee0b2b6fdefb51828a766418e/13012174237.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/11918769802.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/wuwuvedejuf.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/6cdqrd4ekhisro5f8u42b6mrs7/rosap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe63d0bddc2---vuzilenanabixafaf.pdfIn PDF document text
    • http://canadanur.com/resimler/files/90225817868.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/40492566893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=codigo+civil+comentado+honduras+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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 11264 bytes
SHA-256: 95c8e8ca29e5eaca957ff80673b12e4c68fe0e67a400eb277402ec5d58df59a8
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 17772 bytes
SHA-256: 3dab090c88eb56a978edaa8ce4b03e10f27871c0a95cd59f08ebeb3241ebe620
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1