Malicious PDF — malware analysis report

Static analysis result for SHA-256 6999c4ebe3975eec…

MALICIOUS

PDF

77.5 KB Created: 2021-07-25 04:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ffbd5a93f257d20226cb3c7494b4fe6 SHA-1: 3bfb483f315577c123078a184349c9ec11219b06 SHA-256: 6999c4ebe3975eec9e24e88f57ae9be6490d204f1455192487248e074a27ff5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure as a link farm on potentially compromised hosting supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/df06433145cb4dc21b480597505bcb18/gofimemufadegatovosonuli.pdf In PDF document text
    • http://carszana.com/image/upload/File/sazowoxonuzupizo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2946ee7e56---zibebirobaxofugatuseru.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095d554352c6---7849164749.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/30953068032.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/fizewazi.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/23690146792.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/838692b67a818d35c25269787b653d03/31792395305.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/25062058999.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0d1155acb5b38069b4530edcd28db8dd/35612198855.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/batemexolixop.pdfIn PDF document text
    • http://consade.com/userfiles/file/zifuzatavu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9qj6oj25fgbn6d6cgd3lcllsv/tozifepuxaxuxamumagebozas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f9cbe068---boputewusowojonotiri.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607170d559f45---rujigadal.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/47638706907.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/rozosizulavizezig.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/joxolokujejumo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/folibaru.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/gadenikuwumiwatepus.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/sufexoketemisipoxuleb.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/wojeteziboz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0871d2dea---96927139387.pdfIn PDF document text
    • http://www.520amis.com/upload/files/66565552953.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/97445727478.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/777804dd735b66fb12c20a5c5b789392/lezozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ilkokul+ingilizce+g%C3%BCnl%C3%BCk+plan+%C3%B6rnekleriPDF 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_off0000c41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41A 20676 bytes
SHA-256: b1b67d9a93aee3f5b66a0c8f800ca5f71747319d43b4a504e9371d6e5d491818
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 10892 bytes
SHA-256: 60e749064ea61e3fc5d07c9514776ec2dc3208ea75a3c6c792c4abf7d603d83a
font_02_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1