Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfafca45af131bf3…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 16:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9f066f6ea77a2b35b9ed3293961faa6 SHA-1: dd719b517fd15eec17d6d56ad208c5a8318820e0 SHA-256: bfafca45af131bf35b518576467a9960c84c5de018d689a9b789979ee55cc6fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=fancy+letters+font+copy+and+paste PDF link annotation
    • https://hnhaa.com/userfiles/tnejp/files/sotaxer.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/32685443955.pdfIn PDF document text
    • http://hasyo.net/files/file/wuzoliwufajawesol.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/47097014017.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b5d6515---xenoruzobusukugajoso.pdfIn PDF document text
    • https://anfauglir.com/images/file/45972408434.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/puxitilog.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/11872431925.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/87023178939.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/14235033664.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c35c7477c---81071103779.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/30459785847.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/81205308480.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kizukezome.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/ralagukebalemuzo.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/5425835462.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/nufufijos.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/pelebanilofagatupu.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/jegikoriv.pdfIn PDF document text
    • http://elskenecologie.nl/files/64474021951.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ph34ltuds06n2pstsbcaln8dp4/gagarobibipo.pdfIn PDF document text
    • http://fxlcd.com/upload/file/45060173491.pdfIn PDF document text
    • 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_off0000acc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC0 14988 bytes
SHA-256: 7bba3f0f6599b7d6ccdea6c8af66525fb235e4ee6d9d342aa7e89f499e76b9fa
font_01_sfnt_off0000d241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 10612 bytes
SHA-256: 5b0155270e5bccdec69e29100b817a6b0e8c79fab4d8a048f9cff079d188e861
font_02_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1