Malicious PDF — malware analysis report

Static analysis result for SHA-256 887a1ed10daea5fb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 04:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee528f145a36ea6c9cc7c17541db4d20 SHA-1: 6b5feceec736173a0a5f264a2ed1ed474bba37b1 SHA-256: 887a1ed10daea5fb61bcd16b9c1b6e83eb90a3921f4514e1665e4f113d4d6841
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to multiple external URLs. Several of these URLs point to compromised WordPress upload storage, indicating a tactic to host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffffba4b45f2d05d07bd8ecbc07928ba/91547736333.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/25574085750.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/21494459102.pdfIn PDF document text
    • http://jar-ted.pl/file/25689316084.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/89312805099.pdfIn PDF document text
    • http://consurs.ro/ckfinder/userfiles/files/lebebumadevijivi.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/62588659663.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/ronuxapifosibejakipuxisim.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///63070100827.pdfIn PDF document text
    • http://umhouses.com/uploads/files/pivasupizosuvudebujuvud.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/sozubupukakejerulazo.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/59019114157.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fewoma.pdfIn PDF document text
    • https://taperagi.com/contents/files/5231813242.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3d8761c6e46e458d632fcebfd40aef06/72359758733.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/77223936393.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/15435390122.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/35b645486ac2b68baa80c252c8583060/furozewanepup.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/guwusirexejudefilijomiva.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/vadilegetuwipura.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/sitebaxupajujiwasupavu.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090318045971.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/lavonerexinotovo.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/89069389435.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/84870043400.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd4b453ab---musopuzo.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/kosenotojenarote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+do+a+screenshot+on+androidPDF 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10712 bytes
SHA-256: c6e43aa7db0f15a2639817c148de0456f6f2d6277ea2e87e33caec8cf32dd888
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 18684 bytes
SHA-256: c5898616801c9990103241bbea1adae39b4a577509a13c4268a9c2bd9caf428c

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