Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3c4672c63e9ef0…

MALICIOUS

PDF

97.9 KB Created: 2021-06-28 17:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fa493e368057547b0b1719f3be2cc360 SHA-1: 7f5d0e1a6bc67e999b9a8a6a59dabe8a3f7a221e SHA-256: bb3c4672c63e9ef000c86d4a8598480d4bb63504570ba48da7b974b53463a387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=the+future+of+the+professions+pdf PDF link annotation
    • http://dyglas.com/userData/board/file/56935227040.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bba45a28a6be89179b05df30adc4502a/temuxitaxuzirodazuganuf.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/22794381659.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099718d41399---9667807258.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadae0415f---fipatulasanilujotu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jr0f99tk4khk6alorjkgsl58l4/60713019709.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dazukosatasejumifiwe.pdfIn PDF document text
    • http://accronline.com/userfiles/file/begebefafawitovufirobo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/6d58g3ghj0ma7hoggbr68l7gc2/ditubavubajizizovevigi.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/4697704455.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/kuligaguxomisasowuwitoves.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071835d96dc7---21016531620.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6afcb0fb8---senurupepafozi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cc39224d7f110886caa77e8d72a8abf2/89829063247.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/raxelanimi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b2aadd28---gawaguzo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cdk0cqpklrvhfriqdhmk44e15f/47538843811.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/59173322739.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3e308bfa353d0dfa4bc0166f0bfcaf0b/vunanumikaxom.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/95470825211.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/98088294407.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d01f519ba---28449315056.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d0d7e7d2c62720727035f0c13e8cf97d/23280109094.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8812dca0e---mufibe.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cff7807f---baxafudivufedamon.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 10448 bytes
SHA-256: ab9f912f37167ca4980ea2e44449d392137ddd8eb6f3f9aca773ba097d1ae783
font_01_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 17244 bytes
SHA-256: dc730b499ca24e5bf439a7e7cb18699c363110c2058fae9f24e123bccfeae2a4
font_02_sfnt_off000157c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCF 2280 bytes
SHA-256: 18a4c397033891175a5e890e57de9aacace5c75d9f0a89e2d3730fc23a666d30

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