Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4c61f8cc5d64d8…

MALICIOUS

PDF

112.8 KB Created: 2021-09-04 07:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28af79bf041152ee6c615f6d1f66e6cd SHA-1: 0b8409d8bac52880dc56224c2d8863505a77b9cd SHA-256: 6d4c61f8cc5d64d8fa192b3164d6b8e79d0c3766698e2f28146d3b38dd6f7a63
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to external, potentially malicious content, rather than delivering a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f28ea35aca---48434613598.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa77ff0940---lesusifis.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/75243891629.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/95567098717.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/65500220191.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/3143594784.pdfIn PDF document text
    • http://elitacasa.it/images/file/tusem.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a772a7975---97169783712.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/zadalis.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5506a3b72d5ca7956fde06be076c4eb7/89439549432.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc7283b2e---32442840878.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/belomuwilobuxafarodomo.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46081446356.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/38391837583.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/48693225265.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/elb2tfo82s2lvvlolq5uqj54nj/62394067551.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/6730043205.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cc6925cf---gobezijilawotofixim.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/kenimil.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160816c9723808---wegilirotufe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7a3782de---girojilunumiwifok.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/70811581806.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a4b4af7be92093133ae8f8eb58c36efc/59080114070.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wivivaxusuludozuvup.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d0d4d170---9918196274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=paladini+ultrasound+of+congenital+fetal+anomalies+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_off00015008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15008 11064 bytes
SHA-256: a1a87131e72015967fccc50e5687d401e00dc695ff4c6db2cc2d9d44f5d09ed6
font_01_sfnt_off00016997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A9 19572 bytes
SHA-256: 49876f6709494f71802ef23a7f779f097895e0fa54d153b0b92599108020a3ec