Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b73559b860ed5…

MALICIOUS

PDF

68.5 KB Created: 2021-09-10 08:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7513e71292909e3bed70cc32835df759 SHA-1: 8b11665bf839b0cfd5bc2b700691e2e60ea3a753 SHA-256: c45b73559b860ed59e198a9c02ec820bf96b1a8be679e822526285d5b4f48317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a lure for downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=re+volt+android+download PDF link annotation
    • https://fainitelecommunication.com/public/editorfiles/file/fezesadopexibixanelaju.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/kejurizufukivurajugad.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/pigoramikudadomovi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/05206f9ef433cf942230d4a2861165af/ladara.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/mivotakoxaxojulolu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lobefiz.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kekevu.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/tirekiwan.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/58008687917.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/8338934723.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/61973075174.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vikik.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zezexozadaluredimizota.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/50724266871.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109080905529539.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/15824309521.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134c33b201c3---38877179255.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/91085003778.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/wisajenamexezaveba.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/98784520195.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/vizanasuvofexel.pdfIn PDF document text
    • http://dezis.ru/uploads/files/23249903381.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/83324779396.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138978b43ca4---zesoredesepibivapikamukem.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/71863780205.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_off0000b16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16B 10272 bytes
SHA-256: c9e00be38c909acc237d9ae2ec8538d5ae966a94ffd7936d461ecbef8d7852ba
font_01_sfnt_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 14308 bytes
SHA-256: c4737afa62b1f8602e7c5dadfde73080ca466d69f951838ba32d432e08cb0722
font_02_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1