Malicious PDF — malware analysis report

Static analysis result for SHA-256 9104f7985e87aafb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 05:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 523cc2877c0d6cbb659e95f209f00de0 SHA-1: 515e0d3754f410ff1b00d1a1dd3272c897cdf7d0 SHA-256: 9104f7985e87aafb7ea35d8b9061ce2e4f9a3a3bf9789c3e1b8e16ccb6be6ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI links and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=online+movie+app+free+apk PDF link annotation
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/27464289618.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/25182382241.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161309b0e608c1---65530463776.pdfIn PDF document text
    • https://aildf.in/userfiles/file/11360064050.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/zizazaf.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/vuwugagajibu.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/juvexi.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/25088796533.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///89648066027.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/14279264429.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/xupikanozetademolufilape.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/saxabirajinakizowir.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lajakifewavifasep.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/97787041993.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/xisaken.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161361724b2265---20535619638.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905024839684.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/36453478812.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/31383716579.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d9b989fa2791461abfee1da73cddbb8b/67392172167.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/luwuvifawarinixarekobemor.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/nenemagudusawesu.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/pepafukodexugazexe.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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 10436 bytes
SHA-256: ba6e58b896aff0cfe023323102bed74c5545c8c3b17b1ab1f04c09020d779015
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 18268 bytes
SHA-256: 9cc588f7ec8fc3dcea9735ba43ca1c707a068391555f3adbf05b900778005e65
font_02_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1