Malicious PDF — malware analysis report

Static analysis result for SHA-256 666463c4245decbb…

MALICIOUS

PDF

90.1 KB Created: 2021-08-07 09:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08c754acaf118425d355f67f49819c3f SHA-1: 2548cacfece103e3f4f7bcde8cc2728479fa0940 SHA-256: 666463c4245decbb025b036006a862f885238f1110fddb3a4e5bd2fc49376840
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and compromised CMS upload links points to a tactic of leveraging vulnerable web infrastructure to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://animalscipublisher.com/files/upfiles/file/vobosanaza.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160731672aeca3---lunawererepubaji.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/37143518680.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bd93b3e0c49cb6641c5c94e066776d8c/fativom.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30292027823.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/26083565076.pdfIn PDF document text
    • http://dnepropress.net/files/file/69376508127.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eb16cb6631d7c1b54d086883a510fcd0/zowizuvitariver.pdfIn PDF document text
    • http://rld-carbon.ru/file/kowiwalupesij.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ms1tm04ij5ilr9kjf7t4jl47a4/dowelaxozibugas.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b5b93dda44e82aeec426068881bd33c5/66718711079.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec815cf66---70552247239.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073a015204fc---nigadetobidogoju.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/ligisivewavomozisonuxamam.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/279ab36c9344cc29841baf1f66e98d6a/94613741741.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02090ea865---jewarebigiruxizenugokigo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/13761358194.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/48262f47554f68c03ee7e0f8135e6952/74132015835.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-18/images/files/maxojivulinitokuken.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/19641373417.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/zorosogirurufaxexowuxud.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75dc3ad82---42640560781.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bba0aeb6f9e0de38e33f182716cafbc1/54473802804.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/62059106756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=signos+clinicos+de+trombosis+venosa+profundaPDF 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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 11344 bytes
SHA-256: 74a9e6fade1f0828e067fb8f288e661bc215c0d97052b42403b4c43f8ec0d5e3
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 18044 bytes
SHA-256: b3f3d5c3f09a21a8087e5e64c1487376c53f3b1cb0d25453e251b21469314b26
font_02_sfnt_off00013f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.