Malicious PDF — malware analysis report

Static analysis result for SHA-256 89670fd26b05ccbb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75590e106e266bc749e5ca458fdfa7a8 SHA-1: 85cd10c9d8c0183f89c64ba72c047e7bf5b3dd8d SHA-256: 89670fd26b05ccbb0543a7902d14333d57637128682408d94b868fcf7cb65e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple PDF files hosted on various domains, some of which are on compromised WordPress upload storage. This suggests a phishing or malware distribution campaign, likely using the embedded links to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66549f3f---77860974401.pdf In PDF document text
    • http://saint-party.com/media/file/22449712559.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/18793092607.pdfIn PDF document text
    • https://cian.hr/userfiles/file/kobapimen.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/nisexoli.pdfIn PDF document text
    • http://etre-belle.su/images/file/xagowedevosotap.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/rakagidatubotexoditodu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60749851474.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tirewilinilamu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/t6ubotto25n17omn2c9u4dvav3/95257544464.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d2bg49ctt2gv2pq2dlpkud7510/biwajanigi.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zowonexen.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/8532249512.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/36277614846.pdfIn PDF document text
    • http://kmsenior.org/file/files/jubaletuzusumaga.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/dozusolisi.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/59970326978.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/sodowet.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe77cc591f---97162058975.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/guzeweb.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/38073772346.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/22570260475.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901211250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wild+rift+mod+skin+apkPDF 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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 17948 bytes
SHA-256: 6031a74b2eb4ec107710d5892534ae79e77455f37b1bfc6ca0fc8f26e214cfbd
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 10612 bytes
SHA-256: 5e1f924920cd81ee63f90d741f6b02a2f47ea057dede294f1055f5c453d8d6e9
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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