Malicious PDF — malware analysis report

Static analysis result for SHA-256 497bf3ef40333ae8…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 03:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32b31388e7891432df39a246f10bd8b5 SHA-1: 8364bd38abc1d77faf3148c1c94dd26443b4efff SHA-256: 497bf3ef40333ae84b382374058ac66533b43b859cb094aa2d8794beb73e5d77
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://asu78.ru/userfiles/file/wazogisepa.pdf In PDF document text
    • http://carrozzeriardue.it/userfiles/files/mudugud.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cca49eedf---44826174620.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/81750860964.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51a97c988---96709172092.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/9088883469.pdfIn PDF document text
    • https://flyags.com/editorResources/file///zapisokapow.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/bimujifabaviwevibos.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/15705025563.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ccc97bbc2dc1fe1b4ee7775d3b0aa358/joguvu.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/1586354487.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/77502604893.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kaxigupa.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/59060254575.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/diduxinofuxosof.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/padepig.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/25684435466.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090105575842.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/83458bc506fac6bacf0ffe31c51ef05b/liromixexiwixom.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cqie370jdlgs3g7rrgh43lsp36/miwijafatopodixofidewova.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/18110603544.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5o6rou06n0n8u18aamphsrqo0k/pokidoxuni.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/kaxelemokevanoxawakuloj.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/18145638438.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0359716001624367810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ted+voice+actorPDF 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_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 10076 bytes
SHA-256: a17ab3bb7308ff13425e221c40ee2e0b9ddc1ea9c7ad7c60073788e468897a1d
font_01_sfnt_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 17060 bytes
SHA-256: 7991383e17d43a72122b1e1c0b496c2d57960cb61b085251fdd505e41f610c2a
font_02_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1