Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb009bc18fba549…

MALICIOUS

PDF

83.9 KB Created: 2021-08-29 13:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b55473be6e6229adcb1077d34dbf2a3 SHA-1: b804ee92a509959783aaff27bd810a503d2e90ce SHA-256: 8cb009bc18fba54980e824d0ae5e78d7f32369ad5eb215ec07bf852645a8b79b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=cryptography+and+network+security+forouzan+exercise+solutions PDF link annotation
    • http://www.dawnrotaryclub.tw/UserFiles/files/guzudedenedavebubaripan.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/duxafet.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/74739627089.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/nalosufenud.pdfIn PDF document text
    • http://hydrem.ru/images/file/91674919932.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/xiviwimupivutogubopudixab.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/11379827194.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wobolagakeb.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/6131585704.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/v2u37rp5pgmflce47i3nknhf6d/87589225967.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a4592f2d---23860994584.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2168a772b6abe2f05b0995cb7aebce90/rerorazobadomazemusedikak.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/69532034716.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160978f3dde7b7---xojemabilonij.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/pagimizivureperen.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f6b9b6c783c4e6200fbf487fe102e402/76652293714.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa736f15562---bunudetilobisapiluzugofux.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a985fd5a---4252071246.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac785216dfe---gomajizukalidu.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/14676047275.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/motefirenixiruzitun.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/manopitidovinunalib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 17992 bytes
SHA-256: f3482728c3da854eed628e09332e55b138e57985028e8336ca1a2dc03b939430
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 11484 bytes
SHA-256: 408a09848a3d93c18ed183479daf2a3b3228e3c124b432bf58a1a030b5263806

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