Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ce6ba7adaa1518…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 21:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2b81cf77228bee5fe768561ac996fd9 SHA-1: 5a17923a3540070f002bfe6f74214b50162845f6 SHA-256: 04ce6ba7adaa1518708f6f0df1b0ecf1edf6440b38e1726b16f1786f706a44d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, indicates potential for malicious actions such as further redirection or exploit execution. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=android+app+flashcards PDF link annotation
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/salelemubavutamo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jiwezidevame.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dexodizife.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/pevusunubugotobavagig.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914112938.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/sesofatuvamotoputafo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132707e7fceb---98904307965.pdfIn PDF document text
    • https://harom.ro/files/file/lozugek.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wonopuzotasubido.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/jawipiwagonujajopi.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/62498542069.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/kibagotiji.pdfIn PDF document text
    • http://calisnt.com/uploads/files/23618928773.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa5e519d8b15c8535bbcc513e7de9b7a/68955271622.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/24431661585.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e447064---81142740469.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/6088699541.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de29319dfb---9175970262.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/karidomurulanedov.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/zebonepepevasopazuziguma.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/61750042477.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/xegoletiberanemumisoxe.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/95701498723.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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 17180 bytes
SHA-256: 0256e0b9ec8ce3b80727f7ad3c1a791a7d3fc8f0c6123a4c8e307443511d069f
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 10468 bytes
SHA-256: 0b863ff6cec3b88b198f22ce29e1e7f730dd96d3c0be035ac9315c55b0e8da55

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