Malicious PDF — malware analysis report

Static analysis result for SHA-256 852a5c88098f066f…

MALICIOUS

PDF

93.5 KB Created: 2021-07-08 03:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3dc6f4d20fe31f9dfcd9de96a3657a81 SHA-1: 2646369fdafd77c3c621189020043bbdbb77b3d9 SHA-256: 852a5c88098f066f0ee6a688c0045eb924cd1e8ecb542849a241b45847726a59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classified as phishing or a trojan. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s1940s727pj4e3rd9k7v32m5i7/9369676028.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aeebd8457---45992871465.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b040aed3302---kexulabodukelasulolulolas.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/62148117962.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/18885763647.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa84a48126---xugegibijituziseboma.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bowagebesilufirakukuzi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23980708743.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce26c1687---62724331071.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/korewip.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/85791403210.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/39208417875.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd589b261f0---fogowubifa.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/e233a4f977e866fcbfdf01f2f2b8a257/98949471689.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/fanukedak.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160802e6f07636---48930294292.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/74e467210f172ad13bb654132b5cf6d0/pomubejipujokedajavagen.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bijuvutomafawidadeg.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/riditurofagidibejokijumo.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/19939832658.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/87202435095.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1ad7189fa0f2b67bf1a2c8f53c4e42a2/50595024793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quality+control+interview+questions+and+answers+for+experiencedPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 17912 bytes
SHA-256: 0ccd28db5ad11d4637e4c4b04b0818f838742be657152720d13fbb346d36f6a1
font_01_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 11288 bytes
SHA-256: 5fc982f557aba4726a3bb0e4570cb97913d1f1ebd260497ed09182c73b4eacaf

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