Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfc8231e89d1579…

MALICIOUS

PDF

96.0 KB Created: 2021-08-01 06:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65f2e65242ceeef2acf8feeaee877baa SHA-1: 38966fdd1db8bce2567a52e264a12267f0b12b2f SHA-256: 1dfc8231e89d157920f76a3b29f7671d12bd79d1fbf4d81dd1b372e8689cf389
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS uploads and disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/65166769902.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/zuraraxoto.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa5qaeigbpkq5dgcv8dre1cmd8/tuxujatinawamekowi.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/54474884800.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/83968094748.pdfIn macro / runtime command snippet
    • http://anhuishangbiao.com/upload_fck/file/2021-7-10/20210710091517497931.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/58592899814.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0e0bd0c3---bosunofadagevat.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/98612812871.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xozemozobi.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/disaxu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8bb5fa95f569914caf9e0c52c1c61d89/35553816703.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/75628956454.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/fenilibuwoxegepufakuka.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/149c7d2cc8a3fb17e95f21ccbfbe9084/ledutavisozemada.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ecf24578---7350010457.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3464192389---12761470395.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/85234400643.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733278bc1fe---sadivotul.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/32347100219.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fe0b6314---91610455114.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f504e7fc1221eedf59635b3bd547b454/17669095239.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/74340476975.pdfIn PDF document text
    • http://sushimura1.com/uploads/fiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+apply+for+a+nike+sponsorshipPDF 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_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 17880 bytes
SHA-256: 698d054ad9cdd73a5045ea558d5b63c76a344613e2dd80072e1b3c90316f8e84
font_01_sfnt_off000140d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158ED 10740 bytes
SHA-256: 950cfbe4101259905b5f4a898fe34b2b40da41d24c1a3712b5a510e33d0dce56

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