Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbfe15e6e383f9c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 09:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8e16d82105040e24b2532d20bd1a1e9 SHA-1: 0ca28206ddb711ef86341b30c55d9ac3952c7810 SHA-256: 5dbfe15e6e383f9c1d7fad1b353cfb3422daa8c1b9bb62039648abeec52ebe78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to lure users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=plumbing+tools+names+pictures+pdf PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/95ade6ec97862ac550c9368a10c3b441/54119999279.pdfIn PDF document text
    • http://fittbikese.hu/files/file/donaligivofuf.pdfIn PDF document text
    • http://fitviewer.biz/files/file/66251291761.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8069b0fc4d---wekitafuperuvimosubod.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3857309295---87108722968.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90578d767---68735384004.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/98687285571.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/90583803640.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vifarulidozul.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51666b3d1---basaliwokofolisigiwujamu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d9ca3ff684c96a994de7820f42efcd78/miwegaxuxobofetidox.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gesoruzuwefovasofano.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3ef01dfea---56916949623.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/40057226621.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/sawositinilagivanotomat.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/98b086f4eacacbe98e6845c99b6f4954/28701109053.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/89684163266.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/10804390643.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad585556cf0b3dfca9edf0e35651758a/19764208420.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zorotuwologeno.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/76255952901.pdfIn PDF document text
    • http://blueyee.com/upload/file/070756195642.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a7ae423d---nirenenilinimebazerulamot.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081356a2999f---6655584685.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6958cac5a4---63309916958.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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 11204 bytes
SHA-256: c525011105554798bb3302ad31cd24976fb6029d7599a2eeba25b04b6b3b50cb
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 18388 bytes
SHA-256: b564c644c492149dcc451cf1eb9c74e3c7ea5e36cf62f88bd805830f31c50b75
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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