Malicious PDF — malware analysis report

Static analysis result for SHA-256 563c821da53c583d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 03:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65fbbff78feb0547d31ae2c1e046bc42 SHA-1: 754d2663a6c87c21cf2841cecaea564df4c8cb8c SHA-256: 563c821da53c583dc45b18d08ce1607080ce2be5def56d9b0a9407a4b7071f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other disposable hosting domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, aligning with T1059.007. The primary attack pattern appears to be luring users to external malicious sites, consistent with a phishing or malware distribution campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=transients+study+pdf PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8lgc7pnptogu02cfbndbqbhsea/63450807466.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/sojupolezopalanupoguf.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/93711096872.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed25b6d1a---39206785341.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/96264041234.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/18216365794.pdfIn PDF document text
    • https://aashianarealty.com/file/7878993207.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d1a9e0dee---66129931934.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb78d2c3c---ripanusewe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123912861925---judoxobi.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/futepogawutomerezut.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2448a70f93c11ea0f475415bd8c28bee/46834817341.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609993b3d5053---66496233236.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/bazululoselif.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/todorum.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/16786153507.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/44392999188.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/444ba99a9eef63df8bde6b4960f0c9c4/40479296706.pdfIn PDF document text
    • http://ezibra.pl/upload//file/41481815805.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116bf4dc45f9---penekaxaj.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/87002255308.pdfIn PDF document text
    • http://qca.ch/userfiles/file/97551957174.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/33858747083.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/sizalowanajoxobuvo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71de33aa2---vegomabasiralamupij.pdfIn PDF document text
    • 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_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10500 bytes
SHA-256: f159626fe4f51c5dfcb5a3a4623b9ff5a8a010dcd1ed0018e738e70d3ca4ba3b
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 16596 bytes
SHA-256: 627b3a6674bb06ecf580b9e02ec450e36f7c211c9cfbae4568333fdf28376e04
font_02_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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