Malicious PDF — malware analysis report

Static analysis result for SHA-256 72119967a6151f16…

MALICIOUS

PDF

93.9 KB Created: 2021-08-20 23:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 31ef2fc1f6e0cdd0b6565649495ad977 SHA-1: 6d323cfbf68ee0e658805bf11d40222d0b22d3d4 SHA-256: 72119967a6151f16adb6c69003efde0c27862401b7c50b7e2ec4e55253eaa5b0
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=mainstays+slimline+digital+scale+instructions PDF link annotation
    • http://www.peretprod.ro/content-images/file/jejopepafivilufexan.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/47229436344.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/59164000309.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b47adbd5898---48136406764.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/22184324161e1b98d9075e0db5d508e7/49425273201.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/25241693376.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6c576c9696b26db1369b8e0f666cccd7/nutepepivedus.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/bab12aa0249ab144846f04136777478c/tutatulon.pdfIn PDF document text
    • http://sbairs.com/datas/files/37988542824.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dde67d14---72090904613.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/52tbbigc7bthj1sj4lck2s5bcf/bigebumunomani.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/libozuxakanuwujud.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/23876773903.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/80510128450.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/49390360927.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/paxofe.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/gibunawozoligavosifivufuv.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/71728399285.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071969ac17bc---99980063409.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/luvidanegosepeneku.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/givixonovuxegod.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l785o28okkmdekh637ll1dgua5/82203448461.pdfIn PDF document text
    • https://alutat.com/data/file/gukivenur.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_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 18300 bytes
SHA-256: 66d07a4e2d2138a672be6efd678cadde8253e5c2102e47fe0b13f4c1b2f9e49e
font_01_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB9 10920 bytes
SHA-256: 508cb0e6b5bb969e4c0aa8a29b214d2c2b0c6ad09997a97c4da5cc8a24e4d3ec

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