Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f1d9b6eeb4cfa7…

MALICIOUS

PDF

82.7 KB Created: 2021-06-21 18:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 97a7355e0a6ce626d61518812115b0a3 SHA-1: 0bd915ce1490875b05c2d6f78bf1982b5120c305 SHA-256: 10f1d9b6eeb4cfa7351bd17e9466b9ab037837811dbe5d06fb889ff08cbcf3fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The document body, though heavily obfuscated, contains references to 'Git revert to specific commit' and the authoring application, suggesting a potential lure or misdirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://tanphatinst.com/vietkiendo/upload/file/49629578735.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63b4a7f85---fesibapaxafenogedaweveka.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/231147557288.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c255ea5cd0---49604918523.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4684a66a5794f3b75f60a426a13c3f9f/kasoxajixixifijo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3114376bc220a878cf9ae5a3c98d27ac/83303089356.pdfIn PDF document text
    • http://minerva-collection.net/files/files/34692770721.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77401da0a---55373884197.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/bukupu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ub056f6qnat252gtartk8gm6b3/riduxagasolevuj.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c34eabebee7---88991776375.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210524035556583.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e17bb6da7---20346236423.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ac16449a---35147586312.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/87865840678.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9a66f495---27957373725.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/gikemonimaduvogapimarak.pdfIn PDF document text
    • http://rubensova16.cz/files/file/61778418921.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ad861fef26fca83fc91e7715be58d00e/selijunegupawiwivudivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=git+revert+to+specific+commitPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 4692 bytes
SHA-256: 079cd0e879fc77f9a3a8fbb9c61b340bf87b11604bb14eabcaaf683576f72a01
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 11600 bytes
SHA-256: 71507c1a011af9b0456077a8f88432f3c3adb303718ed609899419c0f1f0b010
font_02_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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