Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67134729c1ea37f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 11:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c484d508c6c0f72235e6fb71269f858 SHA-1: 5c79cd339d61af5ba9d9d9e7ae12552390349677 SHA-256: b67134729c1ea37fdad44d258c666dc90645b96ed87c49dc3f00a79057f78794
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to PDF files on various domains, strongly suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chiaranannini.com/userfiles/files/12757363135.pdf In PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/17301040662.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/murimelapebikibedezojubu.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/nabumevomevowipetu.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/bofovikiruva.pdfIn PDF document text
    • http://abnicum.ru/files/file/liwiwuw.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/37156633586.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/susik.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/gifogixejazu.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/vedud.pdfIn PDF document text
    • https://endobible.com/userfiles/file/webaxawi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161366d97bbe0a---lemofaforekulubelilodo.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109081523042189.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/kakowexuk.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f81206692---50242272436.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161413d274c19c---tatibusozovugifige.pdfIn PDF document text
    • http://it-hair.com/userfiles/6680811346.pdfIn PDF document text
    • https://arerp.kr/data/file///70345981482.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/80893660718.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/542480599.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/xaragefuxeziduvipapadof.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/garotesunaririgeto.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613836cf47641---31514265476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chrome+make+desktop+shortcutPDF 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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 18004 bytes
SHA-256: a9b5daf5a3b21cdaffc4543d340cf28b905535bd5a911fcabebcbce9af1c576f
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 10760 bytes
SHA-256: 44f8e9dfba019a731915f542173a589c913ca920743fc74bbecd36cfa06c34a8

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