Malicious PDF — malware analysis report

Static analysis result for SHA-256 684bdf5dc856c815…

MALICIOUS

PDF

89.5 KB Created: 2021-09-20 06:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7706bc42e5be021f0b4f5fc2489fd533 SHA-1: 8037e82498df6fd5f5f40af2594aee171bc8722b SHA-256: 684bdf5dc856c815fee183e575aec9de9239fac396ff70a46121ddba41cbbb43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=webservices+in+android+application PDF link annotation
    • http://paletydozahrady.cz/ckfinder/userfiles/files/24509510139.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452f6f78f2f---94361468781.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/72699674154.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/vipunijutikevazizosa.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc1a2eb28f9c75ddd81115302b1dd4cb/2468268065.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/tuxifedilazus.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4e9da5efb---44097053278.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/21884736953.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1fcf65863d4988be379bc8b61fa21514/nokoposuluzazexowobekote.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/gaduvofaruxadok.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/95083174343.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/nubimafazuwukuvutoke.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/92271518804.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/61087161200.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/daxedujid.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/33493374625.pdfIn PDF document text
    • https://razredna-nastava.net/files/vuzib.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76526483518.pdfIn PDF document text
    • http://afslab.asia/upload/files/luvimejatugi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/mufujowutajezajaluvaweti.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/lagiso.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/87318380370.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/gakumegejulufesefu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/dowakutevire.pdfIn PDF document text
    • http://freeorden.com/media/file/daxerivefexafolobubi.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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 10704 bytes
SHA-256: 24a83dcc76e6a62b7d24304d9809a42a41babf9a1950cf194c10a2e2a5f857d9
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 18608 bytes
SHA-256: 57b6c373a64ca67732275bf01e657c55ae68ebc18695a68f9646403ad78e97d6

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