Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d433630b27ce247…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 16:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 638e1c28c6aa1dcced5a84f25fd3b9c1 SHA-1: c301b019cdd4c7d536d6db4bf9909e23b8a11b17 SHA-256: 7d433630b27ce247c6932d95ce9386be597f52e05ebd569a702f44b46041206e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ef06d9c7d3e2720b2606cd5747aba76e/88904421852.pdf
    • http://veronikavilla.hu/userfiles/file/51603588315.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f955c877439d2418007df86cd744aed7/libigimimunepesadug.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1las7j442958fn5ctm7a9704dv/87898803070.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aa34fe091cd---falumamuw.pdf
    • http://mousike.it/img_ins/files/83055367716.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dbe8a7320---nowawake.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbb18d99d4---33819569074.pdf
    • http://ecogestval.com/userfiles/file/fesusigojusegovoralowes.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f883c4409a---tukibudiratigowososuvepo.pdf
    • https://patoman.ro/ckfinder/userfiles/files/21018919454.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f25347bf75c901d912ed3488a98eff0/75355799188.pdf
    • http://matstravel.ru/userfiles/file/zomotewulamatitewid.pdf
    • https://its-bulgaria.bg/files/file/zojigatamawufapuwu.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736080370b7---kokave.pdf
    • http://mdc.ir/ckfinder/userfiles/files/vugemut.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ft7hjtef4jqlopa3j42sqls0i0/wexer.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/kkur901jgq6iuqgcft282jlelg/28394398118.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a67921b1a---15801025954.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c060c9b5---50905871451.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1rv32i6b963ddb9bqlujoh4lpp/fofijesozalogef.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b9281dc8---74241825165.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=a+weak+base+boh+is+titrated+with+a+strong+acid+ha
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e604.bin
a41fee9e783987b5d15520e77ab1e6363a36cdb3a2f102b472ef12b32f34f5fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10904 bytes
font_01_sfnt_off0000ff23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 16792 bytes
font_02_sfnt_off00011735.bin
289c5637b79771d19d501ed8291afaa91acd5e0277ce1ab9d54206ada94681ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16108 bytes