Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9871e902165e296…

MALICIOUS

PDF

89.2 KB Created: 2021-08-31 22:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7d7784b96a19a57ecd128b02d721331b SHA-1: 196b065cd1048e72cc948fd00f4a6423d4850bd8 SHA-256: e9871e902165e29672bb3b97ab1b022744f15a54a38c87eeb3f13b97617488fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://taniaandjohn.com/clients/874109/File/zikamakewiva.pdf In PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wapubabidolifazesag.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/siduxorokadukakuzobi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/pigekulifuzoled.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/zabakesujegi.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/83135975113.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/2348218531.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4bb67e30a20d2ca5e02504d4a101ade2/84655094544.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2efc6f6d3427ab37e3f7b57b8c262a54/jivavalogunigozoweroduk.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/15134533637.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/92822647392.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28166337159.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sjgcn4emodhkevmgi36dsohdj2/75869671249.pdfIn PDF document text
    • http://potya.com/92506522880.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c082a32fa---fikoxivikukedazefo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/36788929973.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/20668868861.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/pulob.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609189481ed45---38843171030.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/7799009320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a871e5c70d7---17054746582.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/ribilejegavumasuxowema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tumor+composed+of+blood+vesselsPDF 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_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 10596 bytes
SHA-256: 4d98ff802fc3e0e2ec2b206b0984288ae5e2e7f3b176d58e0d3e1a9b65affa7e
font_01_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 17492 bytes
SHA-256: 67d86d60dd6df2c397b7e89406c10e6811987725d102070600b6c2db5ebf6ffc