Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f676087d1967a1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-24 06:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb51cd106bada213a9eeeb05858afc52 SHA-1: 6da650ebf5447f00aac77a7ed2cfae88e1cce455 SHA-256: 34f676087d1967a18ca3a49ca60b8a167897dc7e74af33f7556aa365d5b1760d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information. The presence of embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing or credential harvesting campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://cructi.ru/uplcv?utm_term=redmi+note+9+pro+checking+code PDF link annotation
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fadamewesi.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/virekune.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/15498215487.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631371748.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/nl5isr69dd0t9hj7tdtuuca1vs/sijen.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/46210328214.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/15211112993.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/98188517938.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/67902711215.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/59364007677.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/josiluxevovideragezofitu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/55187180406.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/1825023324.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161393d29f2677---28523043841.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210915223851.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140902e991ed---32904379326.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/dikimogazorasaj.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/26679475150.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/16089006189.pdfIn PDF document text
    • http://teplospectr.ru/images/files/52777207657.pdfIn PDF document text
    • http://446888.top/userfiles/file/80598659225.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/saripep.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/xamasufi.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vujunilimodidomerewelewu.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/todalaretesexifujonuxexu.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/novufetibabifowegema.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/babajaju.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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 18432 bytes
SHA-256: 38ad88535a7d67085356eceebe452135677f01d2777ab22b2bc04e15bb0c156f
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 10888 bytes
SHA-256: 5f881b1f61bd824f138452c52d3350989a2086e2bad29bb0dd75ffbae070e92d

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