Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc18fd6042453cc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 04:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a96b16ddc5ec7f6144b38d4da0867f88 SHA-1: 0a882c356af94dbef8290d2863cf3729fd33bc33 SHA-256: fcc18fd6042453cc2944dbcbe619d648749363bb41e51ec31d4a2ccaa790ad4f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious domains. The combination of these elements strongly suggests an intent to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://piri-piri.pl/ckfinder/userfiles/files/70733989195.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/aedfbb051dbc9604d6c5aa6bc74b088a/rugizoxanugulonavepoxijoz.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/5967727689.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bd315788f8bb574af88f45a85dbca839/37123530237.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/086rei890bv0c3gd66b0uthgna/supalonepogipupudaxuzo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1c43fcbbc66720af2153d12ec699f387/weloputozagivujeguvo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6aed10cd5cc48598306237563e6ac925/nopiwonidapulodap.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/57c2d9e479444f905c99bcad6d913491/debotumosagawano.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/25fcfe3d2b4bbae96760bca3a088701a/59086189446.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/tesasufetovulufa.pdfIn PDF document text
    • http://seamacros.com/upload/file/26700634955.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/20487128258.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/powuluriborikimibopawag.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/7849636248.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/42854103086.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ad88323c---vinavufozumiruviduti.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/206ql6eio5k3lm2fct7r10svkg/92379408469.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/12394326901.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/63563255210.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bokivalobulamuzamago.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610648cc8b7c4---xavikemegizisixerodoju.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/bagavovutogozukibi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2b22bb45dcc7984cd2b9ad36deafb14e/80068911654.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9d67ed98---zixepumik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=political+science+complete+notes+pdfPDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16904 bytes
SHA-256: 172d99b240979dc8afd54d8c3a4aa9e492cea6120a4970096439b22d83796c21
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10684 bytes
SHA-256: 08460b7bb2124c99a5bb25344580681106674ffeba9c5fc10f0a887ac037b942

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