Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d735cd9b9fa932…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 21:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3dc4392fdf24004fc1159246f41b3a6d SHA-1: 4d937c6dda93897a1f516e9335435674ab91109d SHA-256: 17d735cd9b9fa9323dc3a4a9484d9e59ae1b3b90eb0044ca37ce1b88dc9dc91c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm designed to leverage search engine optimization, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://synerhu.ru/uplcv?utm_term=global+perspectives+individual+report+sample PDF link annotation
    • http://cuspsurgeons.com/userfiles/file/lidodotebunatup.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/rimatejilatalawifozejokev.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/89261435262.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d866150a6c---zafolidotonakaguduner.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/visepezivilulavakilanowuf.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/fagadarifesitorukatudur.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///82517144441.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/df74cf05d87ca9338877295fe81cfd9c/6366353930.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/wejugipikikibeze.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613409d6b1123---25558406579.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lotamejidujitofurelenuje.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901120025996376dk1cs40sb0gw.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/17471478267.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/373227593099ed9f535e9d8623ec943d/wimomonawavajixi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/65389127819.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/wefiloju.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/gajolezemomubariroga.pdfIn PDF document text
    • http://hydrem.ru/images/file/18072685533.pdfIn PDF document text
    • http://888chji.com/userfiles/files/6214458772.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/21459037557.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/83163475249.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/nogazuba.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/9241457026.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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 20472 bytes
SHA-256: 2d88b8f4a9835a6bca701347bbe2117acad5c44b3acf186fbfa37a902efe6f19
font_01_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD5 11020 bytes
SHA-256: f196dfdebf8375253761af31ad66eaa894ea97324ebde047ca0685e74d78a0f2