Malicious PDF — malware analysis report

Static analysis result for SHA-256 d242cdc0be52842f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 10:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3d1a145ed16418e2ae5e577038d8b78 SHA-1: 7349e667012c771ba74dda8be5d2e029e8f4d08a SHA-256: d242cdc0be52842f828d01488bb6693c6e8d38a525b879831623fc9723e7fbcd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document's structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ekselantechnology.solutions/ckfinder/userfiles/files/vabevitidojejutedonat.pdf In PDF document text
    • http://wanyuantemple.tw/userfiles/file/digigeminumudif.pdfIn PDF document text
    • https://pixel.bg/img/file/457825097.pdfIn PDF document text
    • https://naves.cz/res/file/92101996016.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/xerave.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097d569edd51---duporikekazaniv.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/18cojd5vg6q2gmelrojjq4a306/18531822160.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/guwoxomesabu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e1b37b15f3df524e6e2cc2166dfa850f/13375602310.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6115fd1a408859c4376fd3c2e26d6738/63102912823.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04882ff48---kisamumuzejazes.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44df9ee120cd9cb38d4ec7303926d105/81907804446.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/63719676311.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/dejufadapur.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/57903932554.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/vidojen.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b19ceacdf---nofamusobigenaferi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/110831f4d55cf791f6878614a1a95528/jodajebox.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/35000319477.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eff1ee1ecedefde179bccbc09f50f470/94480065300.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/9642408091.pdfIn PDF document text
    • http://edallyshop.com/upload/files/vekarovor.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/76440804813.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdc05b683---54823681360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=metode+penelitian+kombinasi+sugiyono+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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 16512 bytes
SHA-256: 82a306141a0912329da2f7920187f0eb86c960a720a2dbab5aadc563d774836a
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 11180 bytes
SHA-256: 8d93734295ca577c47810409cb21daba45027583f1bdd74eab3be116ce1e32ea
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1