Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9d4d1fc81a04b4…

MALICIOUS

PDF

97.3 KB Created: 2021-07-01 09:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7b127f864cb7e0cb185f3250e46d2dd SHA-1: f61c617a093b6ece51ee344ac8094a47e4cbce51 SHA-256: 8f9d4d1fc81a04b4d7ff64e7f948d52e3c1d05d2b7979aefe74659fee11e7b76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://inwebjor.ru/uplcv?utm_term=meaning+of+reluctant+in+telugu PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcc14a75f9---mipote.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936096ccd---ribotawiru.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b275f97948d---pejigogasobusovovolafuwu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kakerozivosuf.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/dupasup.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160963b56888ab---dumusamudajewujabagezedo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xikaganisuxeviwufezob.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ktlsnap3tc6q7cudg7325lb67i/debiwililexokan.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6833b880ea430cfa85f2e589f0d13327/gukipezasitowikisena.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/69497843826.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c9d69a332812f94afffc425d7199502a/bakijaviras.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cbaec4899---nataw.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4f861cd0---fawapixixamibareb.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r70k0tp53q1jl97djnculom30n/vixanoxitusobexorub.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/8772163634.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/51327550451.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i2e7hu2rk75un2e3r51006gtom/rapapexavisokisegow.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/zizuzelurukuzu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mih1bb2v8f190b1nf0t5s9pe2a/jidinarido.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k05bqfralt6i402hk4jlpng452/zirapokazumafuba.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/nuxufofexikalogijijenuto.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/fizamigebekuvoxarosugusuf.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/vupovivomufapafiwinaxubu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/sulesapujesaxubomapikip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 17100 bytes
SHA-256: f3277ac0d422d4e1868ac0340ecc4a6d0e664ad895240f6c2459a4b57f00499b
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 22624 bytes
SHA-256: 2d66d230aa28a032e035d250ad98cbe27d8eca74f543fdfb962c515926de162d
font_03_sfnt_off00015ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDF 10436 bytes
SHA-256: 5418113716099c59aadc69cec68ed94700d3a89dac118c8da81d9628842d2638

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