Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dac72867830de7…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 05:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 080a49b3dfa455135be16fe499119a0f SHA-1: 2082650afb41811c9168d04e761768fcb61102ea SHA-256: 55dac72867830de7c1ff28b9c2f5133e15173812cc81b31bd22ca080d11b046f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=half+and+half+blue+and+purple+hair
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ec1922f9597cad58aa59faeb95bb9c2/migolonizal.pdf
    • http://bocghebinhduong.com/media/ftp/file/xidewigujofuro.pdf
    • https://cartolmania.it/file/dajijefuto.pdf
    • http://screen.by/images/file/xasujores.pdf
    • https://aronabritcan.com/userfiles/file/2957910094.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9772d842713428e6eea2b4ff616afc57/roburaba.pdf
    • http://magendans.com/imagefiles/file/nejanakedub.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/xofowijiluzafisa.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/81409728691.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e00trvldvbh8mscnusml9q2jp8/51436140293.pdf
    • https://ctapigroup3.com/contents//files/jugewuzixojufuketamuv.pdf
    • http://vencedor.coop/images/admin/file/jiludejuvox.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/23294379079.pdf
    • http://aucoindeshalles.com/menu/file/88809055099.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd83e59a44---42666520255.pdf
    • https://sy-tech.eu/file/favekoguragezudezex.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/d44df097b2a4353a2e16b6a494cb17ff/80585546857.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607975752f1aa---deliworonerewab.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a981a802d---85556010154.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086458846dd4---xolejalibopob.pdf
    • https://bhsbeacon.com/FCKeditor/file/8882486113.pdf
    • http://adainst.com/uploade/files/20210623084535.pdf
    • http://omni-links.com/images/blog//file/susijisoxak.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ed7aa308---16592126062.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16792 bytes
font_01_sfnt_off00010744.bin
17152667734b3f9c0c97c2a05a3d23c7b4c7d95fe851108c1b3b49482116cc69
pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10440 bytes
font_02_sfnt_off00011e6f.bin
ab1f9988316521cbf95b207b28d1c425f8e59247bd0f81ddf15db7d69b8852dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16952 bytes