Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c802c68cd76437…

MALICIOUS

PDF

90.0 KB Created: 2021-08-24 12:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d6bd9e4f976bd6387f3ee12d3ffe26dc SHA-1: aa5e006092c6836d7c31106b69cc4186c101d405 SHA-256: 44c802c68cd76437a08743cf1bc3d3164eb5df44039804833e847b6966cc5e10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external domains, many of which appear to be hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://nomylo.ru/uplcv?utm_term=beetv+app+for+iphone PDF link annotation
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/75281201364.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33ee6ae89---mefeb.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9b97398811a679b1271d206e2d651a6b/manowevafojozesipav.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/45931272758.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad292113fc---61183409170.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/matalowipilif.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/xagotitetukut.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bef8221822d---97640152738.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f6d4305e---xufavuvose.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/36776401616.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/64010277678.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/12477690166.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334a82ffa8---rokuzovosipelap.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a440cc6bfec3b24af022ced987e96662/31796451949.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/6683444291.pdfIn PDF document text
    • http://furniture83.com/upload/files/fuleleponobozeja.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fa23541b---vososijisufoke.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/12094839056.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sa5h3g3l2gnbmbte9fq8upi3lp/22999503174.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ccae3e05b4---61038079093.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/37709586978.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/1406164864.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b72e53de9---80684903586.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e04718e9e---xivorowe.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210821_BC555CD71A23AD6C.pdfIn PDF document text
    • http://camwater.org/media/files/57033652666.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_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 17328 bytes
SHA-256: 0462a2fc782ae262f5cacbdc94b34b299965430c7aab7eb80db9de95ec6d627d
font_01_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14298 10360 bytes
SHA-256: 55c374ee7aea1a339dd07ba1ae614bbefd1097268b69d8509a32c9822a62d589