Malicious PDF — malware analysis report

Static analysis result for SHA-256 f133d596d4f5527d…

MALICIOUS

PDF

110.1 KB Created: 2021-09-08 02:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c540991c7719d6cbea261cafcd2dc40a SHA-1: bafe0ac2bc9f76d1c3b2db0180fed59d5326d75c SHA-256: f133d596d4f5527dea94b041d94f4913aeb35e829bb72cf9f57847a2f940a84e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cbdc.co/uploads/ckfinder/userfiles/files/zenigi.pdf In PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/mikivivujesalu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a5d02ea6---vamosixusu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c39ba01268be877d801b5f04fd7bf7be/wikaxuzuxivokojezuxulopi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa815a4c4---45003022361.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932e53d4fac---27387050921.pdfIn PDF document text
    • https://blogsma.com/files/17484485558.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/kerikuripisifikuw.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cffd8ff664e9aaca1e1ea5861e5f547c/xuvalukoleb.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b4861ae2---wilonawozolaragaxivi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/ridigirixikumabune.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fe1dc40e94bd8e4f98905f965c30de93/susedisonufutegat.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161260ec96058f---12509983633.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/52960677085.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/20290883014.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5474ddef234f94094cf525d748fb54af/lukupaganuselejiv.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/limoleropusavoz.pdfIn PDF document text
    • http://pasted-radio.de/web/files/suzakokip.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pevalub.pdfIn PDF document text
    • https://capecoralliving.com/media/file/85045480509.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/66425919748.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/88086612929.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fibegemevatipabadikak.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/waxusibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=landscape+drawing+for+beginners+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_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 16524 bytes
SHA-256: b2d1798f31803b3d09ab98943707f379bd08df5b6d9e195cf359dfe1491ab95f
font_01_sfnt_off000179e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191FD 10832 bytes
SHA-256: cb95ca586786d410b730de49b2fca23b9e6f7211e8c1380176551c1f11ffcf69