Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cda9c8ae7af8e1…

MALICIOUS

PDF

91.2 KB Created: 2021-08-10 04:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 281ffae1e6d41c20b7314bf4af8a02f1 SHA-1: ef91b5a99eb7e2f077f66d7b8eecf9ce4c2ab60c SHA-256: 79cda9c8ae7af8e191ebf6ff3015ffa907d7e7b4e88b35060cb676e26e74341d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://111-orte.de/testarea/cwsCMSlight/media/files/rarigimimego.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e86a70d0fc951546216ed094b15d29b1/93373793852.pdfIn PDF document text
    • https://bem-sa.com/img/file/45244293258.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/bi248g0j4sdkme4d3hu55d6qvc/73852883100.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/2828021991.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/emve8ok7m0c8u4iulh6b4cp0h3/lezaxike.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/jegenojerisubi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095780a782a4---89559083908.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/18qj4js6mkd46arcv4ihs07va9/77427643674.pdfIn PDF document text
    • https://actorconseil.com/files/file/95226572659.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e897c816a---kekadogizuguwefebino.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/69479373657.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e1599e0d---jamozixixarefewakikagesoz.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/24483616092.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/037144415bc4cca81e0f1b6f52a98143/96139401922.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/surinijiwokazenolawe.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/1455222718.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b37c77068---27392371329.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ceab186ca---98794160608.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1980088880---92903906705.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/76826bdd48087912897293cb9d0b5f08/29285556590.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc045ecae8---vekekebamivozi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0ab987823ebe578952eae1a086e1fbee/wexivafolorodikilesugaro.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/1091877941.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f17057c9---68890826992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fingerprint+lock+screen+prank+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 16220 bytes
SHA-256: 649555a43cf1a87a20afaad28a6a06c2828108a09991283ea91d2f89fef04ae5
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 17612 bytes
SHA-256: 5c747009d9dfe83a08940b134e828701f677bbc8e4ccc27281ba74871535953a
font_02_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 10844 bytes
SHA-256: b0401414d3c883454b4749bc4d231228141a49de4fa2151118515615009e4a41