Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dec817cd738775…

MALICIOUS

PDF

67.5 KB Created: 2021-09-21 13:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25ab09237e44ddfe5eeb82bb82dffa20 SHA-1: 0d88745255fe2a54e01d8ec45d1407709c75930c SHA-256: a5dec817cd7387756370fc27e85971b8aff6a80084929909070a9f3b69c2bd80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to potentially compromised WordPress uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded URIs indicate an attempt to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://currenwatch.myhost360.cn/file/upload/files/09-18-18-44-22-61.pdf In PDF document text
    • https://glozor.com/userfiles/file/gudapasuraju.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/21065013901.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be47e1eb1d---jepowidudokigi.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210915191459.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/24754680782.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/valadon.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/dafewopekipisa.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/malufidifu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a52ab9c06---debem.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/mofadexubexabefojemegimoz.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908084800367329.pdfIn PDF document text
    • http://www.moyekolodin.com/files/72252283947.pdfIn PDF document text
    • http://th-hl.com///upload/files/61983150482.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/padamopen.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/tovusitajoxuf.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/17077356007.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/83379542093.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d7487897ddea64ae4841c6d73cd21829/33043458556.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kufewadarus.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/palajajatesiwola.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/tonopizubemapeba.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sevadotalibigeta.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/voxowupetafapux.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/mesife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=d%26d+essentials+kit+character+sheet+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/74090686094.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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 14232 bytes
SHA-256: 4ae2e1710c7c10f43e38e88b6d7ecf36856daeaa0472d8ae983d87f46896407b

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