Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff4ed6942f469dc…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 12:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33d58287f8f745a0b7bf100019c89eb2 SHA-1: 35d113d22cb872cc935d235c3c86d0eb0e1c64ff SHA-256: 4ff4ed6942f469dc799d3b51c206a50356d41c87a297d8a83a116e85ebbb46b6
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=android+tv+setup PDF link annotation
    • https://specialgarden.ro/userfiles/file/darulilutomuwobuparavi.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/depuxuxo.pdfIn PDF document text
    • http://crm333.com/documentos/file/wokufube.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161459160cb57e---zelofabitovipademixojepor.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/50863107653.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144af54e1cf5---10124581326.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/29758635797.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xutunogorisexow.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/10759695761.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/maxogida.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/mugosuluwutak.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109051704354928.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/pogesiriwakigulufukuliso.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/zaxevis.pdfIn PDF document text
    • http://airzo.net/userData/board/file/84744485157.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zevuvusidega.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///navorojinebage.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-09/210909235416209999wxm0tgabsewu.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/73268410146.pdfIn PDF document text
    • http://kdekdyjak.cz/data/samisafewokakobekalosag.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/38890988307.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd5d3c40e---60594202197.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/kobelufojidoxativipubid.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/80695038766.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xedebufirebivimitepito.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_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 19168 bytes
SHA-256: 5caf737243185bd767a47f019199ca76558838bf8ecc4f5967f67520bef9d164
font_01_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 10324 bytes
SHA-256: aaa0a116a2d2e873e4c58cfbfe4e51eb3a64914cb9f956e9d074111f8a675650
font_02_sfnt_off0001483b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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