Malicious PDF — malware analysis report

Static analysis result for SHA-256 c288cbcaa97e64c6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 12:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85c102ac1a229a31130799eabef1cde0 SHA-1: d4e0ab855f1d2dafe4ef077c64b894332616ab69 SHA-256: c288cbcaa97e64c6fd99f27e606dcf1a4eab673cc8c58c6b00d658f091555496
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to trick users into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sssmri.com/ckfinder/userfiles/files/busojerelotajonevodusen.pdf In PDF document text
    • http://nepalbestcargo.com/userfiles/file/63740967086.pdfIn PDF document text
    • https://landi-bg.com/images/file/5587225408.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/zavaworunete.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/be1449e13a9a5bd263ef3ecafb7feebd/noxipobu.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/78560778922.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/wogezumupuvulaxatifebe.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e52838e6748d8bb02350c50ace33d562/26333832010.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/91433065125.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/84205495438.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359033f1bb6---wikowitoruxixarev.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/25009583502.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/41123099377.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210909095915.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/46246994218.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/sovilotixadadirevutadir.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/metipepobigeninex.pdfIn PDF document text
    • http://nenorm.com/files/files/88010613423.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fakuxi.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/50863292823.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/tafowokeninitosumij.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4tqk32jup1iql7g35g4l3m9hk9/15103682622.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/niwulesuviravorenobaliwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=padman+full+movie+download+mp4PDF 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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10624 bytes
SHA-256: 30af58a2f5c53083054ddd22f1f58dcae31ef80a3b440725895dc4b897cc34f5
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 17156 bytes
SHA-256: b4585636f1eae1ed8d29ad80d0a58e309bfa894693c3e0039bd94b931a8d5a9f
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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