Malicious PDF — malware analysis report

Static analysis result for SHA-256 8123ed98dd3ad465…

MALICIOUS

PDF

69.5 KB Created: 2021-09-11 08:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 103716337fe720b20d93d14216a185b3 SHA-1: 5e943b1f06d8a51514ada0a67781424f0faad706 SHA-256: 8123ed98dd3ad465fcda75b3c795fa2fbbd86992398ca42a331b8a5bf4e3ff87
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. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress instances or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ijpdua.com/contents/files/38098711026.pdf In PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/93093680821.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/17060013380.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gutaxokejatari.pdfIn PDF document text
    • http://leeandrewdavison.com/download/xikubo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/33814223572.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/rikalepujujuragaxibikuf.pdfIn PDF document text
    • http://metallpress.ru/files/91605164723.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_063735.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/51227825568.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/37994149198.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/sozikakoperiwipuxizunodug.pdfIn PDF document text
    • https://datenglagi.com/contents/files/26023512876.pdfIn PDF document text
    • http://wdnederland.nl/file/fixuropefedirufok.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210901/file/16304841105724.pdfIn PDF document text
    • http://scantech3d.com/files/witekuginuvelelelito.pdfIn PDF document text
    • http://tdbm.vn/upload/files/xalav.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d226835---20881799332.pdfIn PDF document text
    • https://uangraja.com/contents/files/28734766066.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21089197457.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136967d3c993---fomikukabaxeper.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376db2571c8---54882380658.pdfIn PDF document text
    • http://salt17.com/userfiles/files/letomonoxodugilitaboto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=shield+tv+remote+appPDF link annotation
    • 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_off0000b1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C9 10524 bytes
SHA-256: 7fcf542f3343bb44ec36acad47033167e5223f86696169a91e65004154363fc3
font_01_sfnt_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 15372 bytes
SHA-256: 54ff709aef4dd74b177499db960d4080cbabe8738dbab1c3bbe64f193a512320
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1