Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd6a2d3a5482988…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 00:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a3cfc23d11abe1215ce6b79f6bc60f5 SHA-1: 8c49c6b8177d347e75e79de41abb37ffdc8b1020 SHA-256: 0dd6a2d3a54829882ebbfb95b8ba8729890de9e959794a036712c6f90068e317
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple URLs, some hosted on compromised WordPress sites, designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gregoryshow.ru/files/file/29819262545.pdf In PDF document text
    • http://rovitek.com/userfiles/file/notevoruron.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/dunes.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/demukimunojujopumono.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/dutarufibelakufilisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614980fd36088---70031098894.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/dusajekak.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/daroromukogupuwaxibovi.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/koxagikini.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/ferunosiwelejam.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sirego.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/funowavebojemej.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/11632807174.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cfa15aed70b8187124da309d572d8516/goximogubuliseliwegizivep.pdfIn PDF document text
    • http://otczenacts.com/media/files/kalosam.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/vosogubawubapa.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nifekefuvuzukaj.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/36556825198.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/timakobegurizerusovu.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/gokezav.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/63292403662.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4949959039b8449bcab9e45b5704d012/fosapilezirunemexomelig.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/kiwunubuvaw.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/22880960072.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/41351507979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=redmi+9+latest+price+in+pakistanPDF 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_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 10860 bytes
SHA-256: 8a1adb571e98f2ee3f985999ebe1894337237fac0b334db5f743a55edf3eedd8
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 14964 bytes
SHA-256: b080e4e477ef23647ce2facc1be449ee8db6be802bd85fa9cff7096e6bdbf93b
font_02_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1