Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e18561e359025e7…

MALICIOUS

PDF

82.9 KB Created: 2021-08-20 01:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7372978325fa0154228e5ecfa50aa907 SHA-1: 9251c644ef0306c5ad9060fa0e865ee5a8c90882 SHA-256: 7e18561e359025e7b38acdce970952ae894403cd58d3bffef8ce03eb33459cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d619e5c6491---fetamapatozo.pdf In PDF document text
    • https://people11people.gr/uploads/File/lixoxiromoge.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zobapedutosafilijexe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/96a156723b3e2dd15b1ea7a3154174e5/bedob.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6db6badd2b---7287539666.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/24841733442.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/venixagi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a6baba7e---8974954373.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lekokekufifaju.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/3386478408.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e920a21e9f9---56790656785.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/43248500401.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/22sgi865fh2paekafg0i4c5s08/mojetovumikijomoti.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2318e0835711ff4bdbc3fcb4b12ed4b6/41189712164.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/52073395924.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/415980f0beaa3464a55f212a71858eb0/64160926599.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/72767355278.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/taluzamupo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/28441688289.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/xuvenavaj.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609031ffe1472---88025793768.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sepiti.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/67opaht1d7ljg9f9nqkspmlehk/39494736194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=percentage+worksheets+for+grade+7+pdf+with+answersPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 11084 bytes
SHA-256: 53ba1cc11d67b09289dcb9583b2a837736af7c6c51b1a842ec4dd0e589ec88b6
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 17560 bytes
SHA-256: 1d76467edd1506c262027221f07e1b5db05fe4560136fea0d044aa7b54b3b941
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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