Malicious PDF — malware analysis report

Static analysis result for SHA-256 88baedd2c43a86f4…

MALICIOUS

PDF

76.3 KB Created: 2021-07-03 01:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: efedffe53cae6a584967397fc82c43c4 SHA-1: a2e17a1e831e350e426d4765960a8829deb0c966 SHA-256: 88baedd2c43a86f43f0a7bef3c26f6728962810fa77e2617c7e9d6fc6f15cabc
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm on disposable hosting. No scripts were extracted, and the document body was unreadable, but the structure and URL analysis strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a322d45e5c5---54267379739.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db812909cb---jizezefiba.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835eb19bf96---bevopa.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/fesivegudawonava.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/baae8e822936380cd068e21e582c4dcd/1533855496.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/11727246964.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/19555154695.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624594424.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2431f40a177cbd923a7702d18a7f2c61/91576906888.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/78373906498.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/18928615939.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mowutedikejijavuw.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/taxijupadi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160812efd92b0d---nojurexugebeleruxafaxono.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/tajur.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/papisudokizexu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/fbbef23460b3c71eb0543ceae89cabd0/musojekujovujedexeta.pdfIn PDF document text
    • https://0900107678.com/upload/file/95395349040.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b4c9edb4a---8824837277.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/gexojovujovixaxojipodoro.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/womujopa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c443b3952a5---50132314530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+craft+fermented+spider+eyePDF 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_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 10928 bytes
SHA-256: be4b8a14f036b96377b44dff2709a013515812929ba7fcff22da0062ea79c690
font_01_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 16176 bytes
SHA-256: 4bd798a982dbd1e7716708ed7f567cc974e905fc2c36fe6ee284166d01b202a1
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1