Malicious PDF — malware analysis report

Static analysis result for SHA-256 383d057ba070048f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 16:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d57a8a1731d1a6827c6e45c31579b297 SHA-1: 85b5c714e152de0010bdcf44ac60151136b50ce5 SHA-256: 383d057ba070048f69fe5658f605c7bb649ae9b89814c5c7922dd40b220c2f39
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm designed to redirect users to various potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=sulphuric+acid+production+process+pdf PDF link annotation
    • https://blogsma.com/files/49960814582.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f92273891c3292a00ef05bff5b32c072/91111390232.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f65eccd1d789e9603cae680d2c022a78/56518956969.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/68155623470.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b202983ce81---ditadut.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/fulegupoku.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52fd0e1feb7a550911bff364dbc11e6e/kipapurubujujuvolavesox.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/bejizoxujiwesuve.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5398cfa8---24876456889.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210803_48F6AD8D33EE0197.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075794aaac72---xobelivopamafita.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/jitimugemum.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/77716573358.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d635ac5f0---99181892030.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b8e024e0---97964515051.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/fuzox.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/29177354461.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/27ce5e1d00704c648bf78c9eff187634/60441034741.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/58802379560.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/dubegamip.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/37259213108.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/61175921686.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/92885832c142395ed2f8c85f081bd12d/pukigil.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/liworiwa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fusimakinudajiwumifow.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kavikozazelolizix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 18792 bytes
SHA-256: ec184492735ead196ad900d07b63332f5d8a471b76e46a1514a2dcc91c2bad75
font_01_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 10892 bytes
SHA-256: 875f14d67d5ddf2d56b9c4fae337705d73972e4f5326094944449e11055727c9
font_02_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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