Malicious PDF — malware analysis report

Static analysis result for SHA-256 08384821cd8d64c3…

MALICIOUS

PDF

102.9 KB Created: 2021-09-05 16:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f191181859a79d24c27b5821a91ae733 SHA-1: 9c4da73f4378e21a4f5729e6eab1014ea8325dc7 SHA-256: 08384821cd8d64c3a1c0f8f4098b03fd1aeb7a1dd92cc1941d8df4365927c21e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dtd.com.pk/ckfinder/userfiles/files/lowududufiwanegu.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/67738990495.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/76990686193.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/xisekapekanume.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f56ef2af38d019eaf09a8c28116daa9e/32415600281.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2879091e6---kexitudimani.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/54441023853.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/woxosexizegakawojalob.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/632e3f8e694beb36e5d732b779cbae33/9395870020.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/5542609329.pdfIn PDF document text
    • https://majubesar.net/contents//files/67970577460.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1a0a9325355d2097f5135aef4367f3f5/22218646991.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3651821ba49dcbd66c665aeeec22bfb4/lilipifupawovafabukenux.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/38804311555.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/57543613016.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/44199193191.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/560suulecl52a2n4kv91pj0m2o/92954725097.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/14823086203.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/60608477056.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zusixovewosotut.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/58823535732.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0312388af---nabibabenenilivugezasuk.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/50234433373.pdfIn PDF document text
    • http://mmt24.ru/files/file/kinepibidekoxuta.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/risejafaxofuwuked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convention+europ%C3%A9enne+des+droits+de+l%27homme+1950+pdfPDF 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_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 19020 bytes
SHA-256: 3252c28f26cb056b542975f39d4a94303a6730b33191609def52212c62b6ba27
font_01_sfnt_off000157fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FD 11464 bytes
SHA-256: f188a92d114e9d4b09da2ad4a8205311fbd79f5cc4859ed4cfdc1a29de208f2e
font_02_sfnt_off000172ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1