Malicious PDF — malware analysis report

Static analysis result for SHA-256 1271dc8006885bc7…

MALICIOUS

PDF

139.8 KB Created: 2021-08-12 00:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79e3249982cb8f888305d007369905b3 SHA-1: 55ba634bfa71e5cfa6cb7f44479f3695184295f5 SHA-256: 1271dc8006885bc7b8613c8decc6057bc97eaefb98291a3d971acdc280f9ffef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 http://lenosada.sk/editor_uploads/files/rerikifokujetari.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/3480c3fb8a0c7249f668745bccaea55c/23433025934.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/guniwoba.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69c0bee37---nemetulonumafe.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e77698a3085242e0c3c2a369f6788179/kometebobanazonifibekugex.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pewenokusumonogap.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/912a01c4622ab52426901089d46d6028/soxawamofademipakobaxulem.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/18469646076.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f240e70a75---vewavelivopinetomofix.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f4ae77c0---88808636499.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/mnfmo68jf4641jdkk77lcsagn5/42121849169.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/18a2f6308280fe07268f0c0fbb6dcf77/56975885592.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2304bd7987---togetubajo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3gt49vg7jlds4d6pmeojvffhks/midinetewokefisowibugeta.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/zasugifufivumokodudabur.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/sapepanuwurun.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/16276362207.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/90139346921.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wolipadularurosam.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/90245400888.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/tavufumus.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/21169397515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=diccionario+de+psicoan%C3%A1lisis+de+laplanche+y+pontalis+%281993%29PDF 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_off0001b9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9F3 11452 bytes
SHA-256: 6a632b9b2facf690d214df96675cceb8dcaa6041a60cf78b2f8f4fc2170bfe78
font_01_sfnt_off0001d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4BB 19176 bytes
SHA-256: 250ad6e24d1cef1cb652204fa985aa14e590386d12f3d80bb50a5bd816bfc338
font_02_sfnt_off000204f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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