Malicious PDF — malware analysis report

Static analysis result for SHA-256 4004366b72f66889…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03face5d80af99087c5e15489230d88f SHA-1: 7ec9709e375f3c1b99caebed7b4dd6cfabc26ae8 SHA-256: 4004366b72f668892df576ba81b843de91cb8de804969fafe6bd2c1e9dbf6a24
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm with numerous URLs, many hosted on potentially disposable domains or compromised CMS uploads, suggesting an attempt to direct users to malicious content. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://lgassociates.in/uploads/63491373554.pdf In PDF document text
    • https://melnikhouse.com/userfiles/file/kapigexo.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/fefupotiju.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/49c5f2e3ba8a34b138f71a450469e080/4707100947.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/67010205980.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd15cf9d5---roxavirosatozefijezu.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/megisupa.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/suloketexu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/borutetidadize.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109061409446150.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/vokogipadaji.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161441e935e84e---59442046036.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/58783956783.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/pazagigotuji.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kavumavo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210917112555.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/liviwudigirofalugoka.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/93041370689.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8202cb6d9c62b9f04c63e2db4eb474b7/95750359493.pdfIn PDF document text
    • http://eternaseguros.net/files/files/36480174001.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/78510342043.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/18251628876.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/7039780012.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/netaxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dead+to+me+roblox+idPDF 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_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 18692 bytes
SHA-256: 8f05ec1797a051a7dda4270209b03d7e8fd1cdd43f586e90539616fdcdadc767
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10380 bytes
SHA-256: 94ca43cfaabcae4ab5df35c1b4257eab897ef3cb2d8679736349e556161aba18
font_02_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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