Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fe21bc219ecf99…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 04:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9f70fe681fdb338ca9be009717e3a12 SHA-1: 114c1a15444ed5d9fe29b591f96c792bac680b10 SHA-256: 86fe21bc219ecf9942c96549ab06de70497e8fe35e6cfb13158671bc971a984e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://copab.tn/216mag.svn/uploads/files/96629808076.pdf In PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210903_C022F822CF8652D5.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/93328169135.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fironatirizagazez.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d28ff8efbdb3559d7f0f92b3d9e23ce4/64228339493.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091803540284.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/xotub.pdfIn PDF document text
    • http://unityproductions.com/upload/files/84135577408.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4bb7179a22aa04c23e146d6f63ce8d4e/52493693536.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/80555330827.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/12767325645.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d2608bb30b8af2fec135d7439eca08ff/26385222868.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16152cb3534e50---26347023609.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/52221184401.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210917_51BD04A44F4C3E50.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210905122652.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/xukolorigilinuxosujitajub.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914141029.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/64481888097.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109161949405603.pdfIn PDF document text
    • http://thecuriosityshot.com/56998451982.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/nobotupu.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210924_AD9FE6F329E91476.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7382ec3e5---zukagejakigawisefu.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/14758339970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=07+ford+fusion+owners+manualPDF 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_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 15652 bytes
SHA-256: 068655f99f4ef2b6ce4945d0bdd702a0cba952761cddc6f091e587dfbbf11ea1
font_01_sfnt_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 10676 bytes
SHA-256: 647e995b0731be2f24b21599e533d2b02679f6338c364c1120485c4d84c57099
font_02_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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