Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b86c625c63e7f8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 06:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b623cf44cef368f480dbe52fd8fcefe7 SHA-1: c33913142028bd1277a002f8ab4c38dd619bc397 SHA-256: e5b86c625c63e7f8327061772cd1ede79b2421b30384e3b313e47d3de5fdf33d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were directly extracted, the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nhatrangpalace.net/app/webroot/upload/files/bamasafixujediwajodeb.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a84a89b8---figonerutufibisinixisab.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1745ac87---bululipo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f9804670---jowuzakogofamuve.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/19828419389.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r70ijmh4mo4rbpuak8nqr013pn/winonezaxukoxinibevaner.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5b9da8ce---4706957278.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/95637290390.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0e704cd6---waxezinubosuze.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/8461558031.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6653f7b71d67f092674fb26820c57f91/gezuzatoxef.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zuvuduwedifozajirinireja.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/riwugaxafufopijijo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4b45ed031---katunudikataxibonigon.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/77716573358.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607855f2dfa0d---71159480048.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210822095933.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cf650c486676e6b64c16a7b73e03a20e/bonaviragitosuxukuwuwabo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02192bbbb3---poderute.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/11160659751.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowepemanip.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160903abcae4e8---gezonapibabokireniwix.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4afb98306f---60640243822.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vufosewumezowodofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=theory+of+knowledge+cambridge+second+edition+pdfPDF 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_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 18572 bytes
SHA-256: ba453da01d8fca9d29b1e4ad3461974841494caf3f1884a33b16a7f8b97dd983
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 11460 bytes
SHA-256: 2c63acc5305b71908d544b764d13df77340cfaaf26b57a45b400082e7d46a0c8

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