Malicious PDF — malware analysis report

Static analysis result for SHA-256 531d947ab93680c2…

MALICIOUS

PDF

91.9 KB Created: 2021-07-23 10:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c05fbfddf30c120492b73fc99f0836ad SHA-1: 9e1cad20d89d0091904e44c03dfd302bd0ea6faa SHA-256: 531d947ab93680c242d6ef282e54cf882ad74e7cc52ac0d7f0b897279673a2f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting URLs are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6ae4a00dd2d7b162c48cfe84f6733c3b/satorowejugaleloxaxuzali.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a544e809---susagugotumepi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4416e131c---3789393853.pdfIn PDF document text
    • https://p87.hu/files/27201121658.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/a19f8a6f5356488d5dc481f2a3c1ff83/94039860101.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa19ed0a29b---75530139058.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb1179a4e---bexorosezaxetegixi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8tg55hgbndubfk5k6t9tfmfg02/wofed.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb05bb0f1---pulamafoto.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/pezojaxo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2343cbc24ad437d972dea0f0fe415d56/vemerupizibufixiwisuxixa.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/71504992610.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/zajilifefepasejis.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842b244c9db---55190096602.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bda0a9bbb6851ed0cfd3f8a4b68642c6/83374513695.pdfIn PDF document text
    • http://aps-mes.com/files/file/66862423247.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db1cc5a35---56299916434.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210519180519520.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/53782122781.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/sawubudoremawefe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8b40138c5487d57ad9fdcb6990d54047/venarobar.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/mafotimo.pdfIn PDF document text
    • https://bem-sa.com/img/file/xapovedigixekuzeruroz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2837ae6fd---zojoxe.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zogozajovuv.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730c6ba4521---99243731647.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b539e420c0---mekelitimin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=aisi+410+materialPDF 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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 18556 bytes
SHA-256: 3a0c59cf3407be151d239e5fad13aa6a4b5e44fd731679683cc64cb85793164d
font_02_sfnt_off000148a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A1 10280 bytes
SHA-256: 3db788f0c0ce580a9dd4318bbdf893d65ac3488cc4d6192f1122fcda1e1c9b64

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