Malicious PDF — malware analysis report

Static analysis result for SHA-256 8807d5f2a1eeb6c1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 07:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e4796688da59249808caa5384b4ae81 SHA-1: 258a83ccc279ef344fe08dc05ffa0ba6d1af0593 SHA-256: 8807d5f2a1eeb6c169aac23415dced18cdee5b3811028a19af60d502a105ec53
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of URLs like 'infrive.ru' with search terms for cracks suggests a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=gta+5+crack+download+for+android PDF link annotation
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/55120269188.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/19611306328.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/jafejorem.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/48399834330.pdfIn PDF document text
    • http://ccadl.com/files/20210915192406.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/pusotupukegabojekoreviwus.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/77783589748.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/463329354.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uto3gl63k02rb06ff2sq035dcg/23852336689.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/88049655343.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/39312178965.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/43755174064.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/xowake.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6afb39e4---vamovexigitekego.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e448a0aa159ff2e9ce9caae300f58e9b/21598546459.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/josinunuwefanizixe.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/91975800818.pdfIn PDF document text
    • http://eksternest.be/images/file/65391959625.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210908_130153.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/xuvukubefuvalezij.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/megamokeximojidinedul.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/foduruloxomefufivala.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/83460645186.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10520 bytes
SHA-256: bd91d3cca1a4f488d04203f09cb1326220c769b699aa066e724d229539c8fb12
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 18804 bytes
SHA-256: 187cc9c2d230cb533b54c7271b7217e6e2f84c44df7f7107836686671d6c7436
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1