Malicious PDF — malware analysis report

Static analysis result for SHA-256 221460e052720614…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 02:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb84230e3187b3eebd82241c595f6141 SHA-1: 63f951bcd1fa35cca469f9d0315198305d5c8651 SHA-256: 221460e052720614b1ecbcaa7ce3b99943d0bd0cb90d14fb21c6c8a91d03490f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded links to achieve their objectives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://studioconcept-stand.com/fck_userfiles/file/filogiku.pdf In PDF document text
    • https://beyondpins.com/calisma2/files/uploads/95153380422.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/41835742888.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/50469113299.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/31578717798.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/29166278895.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6814805bca4cea4eac1c8aea9d82629e/milekoxo.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/74006100169.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/61667402301.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/76644877857.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6e2bf7e---54522397026.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/48989907004.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/26233359866.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614469c85dd08---86204649027.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144e88b8819b---22901001748.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/tulilorusixixig.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/ribezodamusodivav.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/muxasesarifimeven.pdfIn PDF document text
    • http://synfarm.com/upload/files/gewojiluzelepetumiwige.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/76367015196.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/zubifexixufikewiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=run+3+gamesPDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 17648 bytes
SHA-256: 523d4c2954258294ef05da37e646e9a09bc346d3d739124fa86041ba3bf19dff
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10312 bytes
SHA-256: 04c872126bb1c829e48bd203cb2b3cbdd0dbdfecd941814e54f2e72482fea3a3
font_02_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1