Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e76348df2d22a54…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 20:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26cdbd350f8fa76663b36127a4af812f SHA-1: e7691ce58a64f97287c9d48a1d11c238848c5c7c SHA-256: 8e76348df2d22a54f42b574995dff93a2cd88facca7901e60985b5fefb47559b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or phishing lures. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e45308013---35306625313.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee922856f3---81155290187.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/97514471387.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/5479511171.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/52684171810.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/vumufidi.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/tefojiwojegewekug.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/diboxokej.pdfIn PDF document text
    • http://acelybio.com/upload/files/duwudapuxerezane.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pigaweboku.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912190827.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378b238cd3a---rutifoponifijamore.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/38197792678.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/59616276187.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48f339fa---pipezafik.pdfIn PDF document text
    • http://kotolantopeni.cz/file/6545171645.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/18572989649.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcf48067d---tawalavogi.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/mikuluxuwetapaxidevosi.pdfIn PDF document text
    • https://phr4u.com/files/linelodubexose.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/wifar.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/dodofovadumenak.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/59244223109.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/23258793523.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nigigolepowejolizagen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+kgb+and+the+world+book+pdfPDF 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_off0000bd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 10800 bytes
SHA-256: 71bbe238adbc5c49e66b9d0bf3da454ceea9761d54b259b5310cac25246b2816
font_02_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 16080 bytes
SHA-256: c6600bda5345afac33a1ddf0255d0342c042a7881347f5b76c10e1431b956bc9

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