Malicious PDF — malware analysis report

Static analysis result for SHA-256 266ce7e87ef9ec71…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 00:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f17c823681288be1a112464849c351a3 SHA-1: 97249b74afa40f8c46933a3c3925866a85de5d7d SHA-256: 266ce7e87ef9ec712dba36694f66b18ac37c260b97ff925e89eeda3da98d3fd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://millecolori.it/images/file/37848411397.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24e99ba95---rukeke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c398c3e868---vinizegolif.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/86696265763.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/linogidosawupux.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132254843329---78628960680.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/munuviwubonur.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37246326338.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/64613283380.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/xepunikejiduwovedapijizor.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32712f830c21fae55b0df2304cd73b0b/21388950464.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/xibug.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/pibofu.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/81745167373.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/67400672415.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210912103416_1300205742.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/20882109573.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wusolutelitob.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/pagobivigi.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/wafezagekilevafozofav.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/folitulegelijowirade.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/bawekul.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/sowotiguzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tej+i+love+you+moviePDF 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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 17256 bytes
SHA-256: e656b40056ab5c14c6c51c084c9f92885f97859c9d29beb2438789d34ba0a2b1
font_02_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 10012 bytes
SHA-256: d67f9b0d60aea8a8d3b0ae6bea294c218ded5056e400bfdc55c970130b3ae246

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