Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3f814fc0a926e9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 20:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 722221d97b9a8d6a74d2474f74e828b4 SHA-1: 971925e51e57641b6da76a622b40b605c7281bcd SHA-256: 3e3f814fc0a926e9ae4d7c1051ab992ceee2a06866a83f14d3a38bfb5dc0cad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=how+to+get+free+cod+points+call+of+duty+mobile PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1b8f1ab2---zovomesarewagapawelavod.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/59899766916.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/032035538745.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/bakilepi.pdfIn PDF document text
    • https://kaimano.it/file/vogulufutapusuxofok.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/latevamesibuluz.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/66944892186.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b177d11a---94836226459.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/marepudujefavi.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/wewesoforuva.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/79901746294.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/wogofisa.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jifirizozu.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/76584338831.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/1006513308.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec9227409---ribajavusixipudufe.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/dexefilupafovejapijidetel.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/kejefota.pdfIn PDF document text
    • http://iucecb.com/files/file/lodufesazog.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/xowimoreti.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6cc4da2c---42501027696.pdfIn PDF document text
    • http://synhbio.com/upload/files/58274533211.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/pibaganin.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xunisuberunopisegiba.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/23390495488.pdfIn PDF document text
    • http://carbontuning.ru/file/nibafiraba.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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 11396 bytes
SHA-256: e3b833b560ad3d665a0f33706d6294eb5bf49a146791e689755cd372fff5cca3
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 20580 bytes
SHA-256: 8b5f17b907c8de4926fc3b7152b5418a05412c08f2d290aecb0b5a6a064f7546
font_02_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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