Malicious PDF — malware analysis report

Static analysis result for SHA-256 f340ea8acd4332f7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 04:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 32b5e211af576c4ad4218c4f4e419829 SHA-1: 7be74d32d051aa3df8c1ab4741259121c2fc80cf SHA-256: f340ea8acd4332f7505a2a06807136d3a65b38b92ca44c9e1f569dd187f64f2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pejesanas.pdf In PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/26942273514.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5b95b3085addf876b933cff94d0d9c3a/21970410520.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109061736591092.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/vugegeparezo.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/sozubupukakejerulazo.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/vejosifemor.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d4d91eaf2f.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/legej.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/30092330729.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/581761161.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/paxumapiga.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/72892502846.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613076c182400---57649557790.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/logujobi.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/mafagesuxutesadedutubuv.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/wepame.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/gixavomunop.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/gawenomiwivilo.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/xedipowo.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/95508755045.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/33708140018.pdfIn PDF document text
    • https://solturism.ro/images/file/4092225039.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d77bb9adb3a8cdd0b0ea10843c39cb36/36527974404.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/78794160498.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/10dc110564b7051d45656fbedd0a20db/16403934721.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/loferuboxokujavalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=basic+technical+analysis+by+john+murphy+pdf+free+downloadPDF 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 11508 bytes
SHA-256: edc1b66f70056b4d390cc03a3d5589cd8356f0d732ac835827a578ea3aad5ec2
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 18064 bytes
SHA-256: f3107b79e8191688e9ac72b8ce28c307299250d65136be4217d9ceadc0d58e49