Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82d38b35cdaa354…

MALICIOUS

PDF

87.4 KB Created: 2021-06-14 06:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 66e32c7664eb87a38cc8c2617de02d62 SHA-1: 07db929ca626e520fd9b292a67a1844e757eedb7 SHA-256: b82d38b35cdaa3541a9c6ffc019e91fe0f8d948a897a3c1f1f9bb6477cc23196
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 0.9995

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://ketchas.ru/uplcv?utm_term=kannukulla+nikkira+en+kadhaliye+download+mp3 PDF link annotation
    • http://pelesiuvalymas.lt/i/File/mivuramav.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/15977945910.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/99832303796.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607289655df9d---49859146492.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/74894394262.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/mekigemigexidari.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0314a6f6f---42930373689.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/219b2svcsdbci03bicoangp196/20665670421.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f01b972f5---veselovefulavevimixof.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a994af237cace0af537136a8ecbf960f/fodilokasapojibabusopiv.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/8c01bb376db7410a811f93fd06ffa3e6/80750180809.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243335b292---xuzisitoburujozado.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fd41f7f57a---tavinufefu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/882992c6c9161bdca497b826aefac676/pavobaziduga.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/balezenoduvejiredibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 5412 bytes
SHA-256: 5ada4c5ca5d43bb826d432dc118f52c79f2fe2c31dc6cecb75aa3e7cf30c4360
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 2344 bytes
SHA-256: 9894fb58739faaadb7718e3d2427d87afd5bc7cb0a21ddd5acd24e7d7ae18a96
font_03_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 10912 bytes
SHA-256: d051c76032d85ce08e77393ad54ae6ddc84dd82994d94e8995b0bd723a3369bb
font_04_sfnt_off00013804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 16852 bytes
SHA-256: 127421b191174065eaaaad280198ef77d5b20046a2a4abcee19127e9e41f97b3

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