Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73cba43df1540ce…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 11:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 570cc214f6992cf9370f79624b735e20 SHA-1: ae201153fe32e30290bf6b77898ef782e008eb76 SHA-256: a73cba43df1540ce9d0ece3ee8aea9224f0fce969048b86b3f7b541a29b42e62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as https://archism.ru/uplcv?utm_term=descargar+juegos+android+gameloft, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://archism.ru/uplcv?utm_term=descargar+juegos+android+gameloft PDF link annotation
    • http://sun-dr.com/uploads/files/202109151824067532.pdfIn PDF document text
    • http://fourfoods.com/images/files/xadidakusitijotas.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/23783312686.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nekaparonanajuzikofaxaka.pdfIn PDF document text
    • http://fxlcd.com/upload/file/99745196225.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905072056.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/42718410830.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/mukovi.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/demovoxikekatenaluvikepe.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/28996956147.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/fixinizapubowidagefawupet.pdfIn PDF document text
    • http://pmke.cz/pictures/files/83774783498.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2010ff2112afb9ac5217b2252fda50ea/raxavidagotibu.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/5351713986.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/lisadera.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/87104063139.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/55466210315.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/81f417c168c45091c0caf6d6784680b9/98073460105.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/65225269644.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/66441688023.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b06b1bb7634cc8a9268de2c4cf4a95ef/87286212429.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/tapadofukaba.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e025bf062---mozopizimolajozokewezove.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/fubisapedaxaru.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907155758529.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631596128.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d24b33f6---rotizoragexoje.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 11048 bytes
SHA-256: b3ec87dad5cdcf4d334574c55897aea3562fc5afce07aa2c435c77b4d1503387
font_02_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 18648 bytes
SHA-256: fa5f81f503d5d896fdf5609a98f706d033c7f4b7b68158ee2b6f425b9718adf5

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