Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdf4b82cb4eda0d…

MALICIOUS

PDF

90.0 KB Created: 2021-07-06 13:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6925606a1bac4370b40d4a86575c05a2 SHA-1: 1e350d073bc5caf0a36fcff4fde6f139ab554195 SHA-256: fcdf4b82cb4eda0d0fe5e59b084e33a94dff2de30316ccdf28858df5760b3795
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b94335ecf4eba8165ad7db6e130db8a3/36431901420.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a044e486c17---19944035012.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075a21650bcd---20818210555.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/xewowabepeki.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/82717946664.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2b5c670af33e882ccd44d4fecc9ed09a/8809143686.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593164ddb9---fepiva.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/dogidibatuniditunawuke.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/11febf686d703a2cd8832d4b42f360f3/reloxibumirarip.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/15215574215.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609caeddc4993---71847253539.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/36945792168.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/15074278537.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/6fkmnqlglbbt76fhlrrqm73f6q/96370602888.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/caacff5840fe968cd322f41db8163acc/49127978101.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/3935954100.pdfIn PDF document text
    • http://armanetti.com/images/ranexufogot.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/44962781800.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/59488642294.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1cd6dca9---takuvuzim.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/99415536484.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ef1200c4c77da199ed6b1f7cc7fdbd98/77081607651.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/87496913435.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609655280d1dd---bifosekesujififapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bible+verses+about+dads+lovePDF 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_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 17240 bytes
SHA-256: ecd0a594cd54a4443b1dbdbeab3e4a92bbdaf8a69c6bc42e935d6eeb1cc1cfc6
font_01_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 10496 bytes
SHA-256: cfd4dd821efd905f9ee3a351e9a74947209dfe19146ea7e014f3705bc475ec8f
font_02_sfnt_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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