Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94f0b62fe344178…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 01:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78edd08bed6bedbd0e9e25d6d644fd34 SHA-1: 325f7dd286ca105f55bdda6a5acb715a7141c914 SHA-256: f94f0b62fe3441785578e9c387839d006e8a42866caaa116fb530da6c9d8c487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple malicious links is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=what+is+the+best+night+sky+app+for+android PDF link annotation
    • https://mamap.in/ci/userfiles/files/xetela.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516264c5---sifutirakap.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/302149641.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad73511be2---pudomezarol.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/80247250458.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922151202.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/67395112082.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/78704128453.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/jibumobefe.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kefirokoxapogoberipilaru.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/vijorenarotevi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffeb9b66dd---78477071683.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/gimevuxeka.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/80769999221.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210920_213152.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kp8uokvbrs97obqe5o5s8ik41o/xenitokesopupizafawesu.pdfIn PDF document text
    • http://martonelektro.hu/files/file/kekejebebufub.pdfIn PDF document text
    • http://carbontuning.ru/file/tipagozataminumuluxirep.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vogekodikupijafukiru.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/zomor.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/84778815531.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/nipozifaperanopenubazig.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/51816802706.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/xiroxamibuzaranolexo.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/liboseremejokejefafina.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_off0000b744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB744 17496 bytes
SHA-256: bb3f42eac379e63fb3c0e3060a75ae18ab0485f64c18c92ff286089605ce5a5f
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 11068 bytes
SHA-256: fcd16c4729babe319d7f0d73bc9c7cfbf69e42c84a1aa2a5af42a835e9c1f431