Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e13cf89df8b70a9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 04:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4223f4862b4f8a6fefd043ec9f1bae7b SHA-1: be097657b37d6ec521c7941874e52c9424d315ce SHA-256: 7e13cf89df8b70a9694e9140b204a1b6ab93e2c7de7ed93b3e421d4943e4c44d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://flatadministration.com/uploades/fckeditorfile/movutulewilevab.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf6d52db18---riwobifijagujuwusu.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/xafosezawumadelepepa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0883954410---zufozupop.pdfIn PDF document text
    • https://digireg.nz/upload/gawetoledosebezanu.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/xezitibutuvodudelidoviwa.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/xuzukabojibi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/91114667599.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/kawedifonagom.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5388a144---tinamuvowutuvox.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/96862963009.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///ziwokoxuxaxutolabakexogo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/24sf3akjl8saht1cukjfuied10/naxorunajuvogopozir.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49baa7ff5458e92f59faeca7ce0ec4d1/gobezalinadanejodof.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pamesu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/25802972797.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/83110781930.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed343356636---gudufu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f2a973c64---23021000489.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/pedifolipisananuwusamedo.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/giminimetanilozanasav.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ja2v9tohk8mog27fusldeh9063/newexulevigimol.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/lufewaputuxenador.pdfIn PDF document text
    • https://chptravel.ir/data/file/4773477881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+a+hypocritePDF 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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 10428 bytes
SHA-256: 31288d9c81021ec935fbef066974415975e004e0d486ba49e0b8f1ef1cea8262
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 19416 bytes
SHA-256: 02840846934e67b6f52744e3e2c0bdc8271a10ab38a5156addb9c9c74e6e43cf

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