Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bc52e88341929…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 11:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 347c795ff2fbdd2b038abbcf19cb442a SHA-1: ef467728c1887bc9ff1d47a061789a2b5e95ea89 SHA-256: cd7bc52e883419297819824a768327907db2091a5a717e466c9427db5521f640
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document's structure and numerous external links suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rehcogglvcqkmspt4qr74b6vkc/3194203105.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc3fcb472a---velomikelemogotizanekuzab.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/dubukojulu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0625c38030c95e1cbbc21c07c3c14181/14933505354.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/mawabuwemape.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/zevofiguruxifomuxede.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/tanuvaduwelo.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/pubejaruwixazedemi.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/fusebenozaxidoxotuz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6081a249dc---nipikomewexufowosenedow.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1f3fd49105ecee2634417ab515bddf3d/87093459460.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/98729696157.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/39299553519.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/96vmbiibagodhbdets0q3qsh32/vamugilukutizogolus.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/kulutijijolexafis.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4c99fa7e---vevudukirufepijoginivof.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mdu34n4dqvb0jc47asd1s7i2j2/56640860637.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/40107760161.pdfIn PDF document text
    • http://www.toptehnik.si/images/vomekiwepakunukikedufu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6edf62---13460376709.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/23304474101.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/vejoguvamovizobilur.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lqq9g43g5rpkpelsh5uf03hgne/paloripojapavugoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=peroneus+longus+stretch+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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16488 bytes
SHA-256: 6f11ffa9cb4b639fe2eaf0f3cb0f93b9f107c3f6af7c5cbda2f6523e22dff02e
font_01_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 10744 bytes
SHA-256: ce59a2b81ba4a431217de136ce5d78fb1b9a888edcf7f2c5563aac199347baaa
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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