Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a35d1b2ef2bbd9a…

MALICIOUS

PDF

128.4 KB Created: 2021-09-19 00:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f886f0a6b0824bb2aafebee23787d64 SHA-1: cf695dbbdc8422e03884832cdaa0900847a16578 SHA-256: 1a35d1b2ef2bbd9a68f69b4eb640005e86558eb3c7c77038dcbbca20b14bb0a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.facyt.com.ar/ckfinder/userfiles/files/likolaguv.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d26891a2---vetir.pdfIn PDF document text
    • http://robbes.nl/media/files/55676348300.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/1963531439.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7b6ac004.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lonirejurafuge.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/97437202015.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3463788e---pusekawopajumefo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/aa7f77df6520e10c6aef6377d2a0cb57/73199333872.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/jolawirebodezomuvenorak.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/323fb8ffbb2570d71548db5051b33637/22795024241.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/zututatafuroxelazu.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/25928923678.pdfIn PDF document text
    • http://riversedgefm.com/files/file/43862691880.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161463f255f00b---9741281030.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/77066327911.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/petakejal.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/79916747883.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/57404899428.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/81337693992.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/tifetiruporagojiz.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/ravoj.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/wilogojowetadonanajagi.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/58327958475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gta+san+andreas+in+android+freePDF 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_off000193cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193CC 18560 bytes
SHA-256: 049dcb85ff1d448e834a9142c88e5cc7214d0d508596d3a09272f34b77c4a1de
font_01_sfnt_off0001c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3CD 10340 bytes
SHA-256: 69dcdf3b5ad6a262f2b478e8c3d68e10002b95d0fb1a111d2910f5ba70c860c8
font_02_sfnt_off0001db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1