Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ca64b8ae58ca5d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 04:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8b027292beb3c343f5bf610fbca8a33 SHA-1: d756b053c82539791094ba829c232f772d17dd04 SHA-256: 38ca64b8ae58ca5d08f22e88de058aace1688afa533da3f34b88d4f279f5d63a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The primary attack pattern involves directing users to potentially malicious websites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=emulador+neo+geo+android+descargar PDF link annotation
    • http://forma8.kz/ckfinder/userfiles/files/metelaziluvuzuvibu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3b49c64e86130aa33c0be1ec5d194ef0/30416103832.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/vusuzunutuvamuz.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/pigonugefoj.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/43436925434.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3be20a798e21be378bdedd31e0ebd5d8/31249782776.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/mezudipemesevazokimivine.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/pobajisetumefibemafebu.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/sizemitot.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/jotadaje.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/81219881000.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/21359608428.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/65371336666.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/4288316255.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/50372492049.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/69ff82bf3ab14ab4ee61c9bf0f6fe905/mozevudegalakijopetun.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/podipalevanapepemir.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-3/20210903162332316119.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/80336275319.pdfIn PDF document text
    • https://slotpt2.com/contents/files/31139590377.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/xivagepovonex.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gexikawi.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/38111609881.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10700 bytes
SHA-256: e1e8a10140f51b0e944958aeceba388eefb98dd596ebcab35c6372d97e5fa41a
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 20172 bytes
SHA-256: 4a9c5dd0d523f5bbe6a36e5ab2fa7f6aeba67a98492106bb79dea44a6f733ae1

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