Malicious PDF — malware analysis report

Static analysis result for SHA-256 416832b4901ac7aa…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 15:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 067e2a0ab11383e902dee340874d8711 SHA-1: f303003df3b1b3aa9b68bfa4bdbf8d2cc4453907 SHA-256: 416832b4901ac7aac6e6aa69bdc7aaa78104b93eb2a7ca92ec123e5476d5f305
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a chain of redirection likely intended to deliver phishing content or malware. The presence of multiple links to potentially compromised infrastructure indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5418993b---nimewexo.pdf In PDF document text
    • https://mosconi.net/userfiles/file/ganupezajerivanul.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/59628099076.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kfb4qhpbkj8bviolo0lusbkm65/jafudigabori.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/01b9252f84e6399d82f4cfef2b05f503/18881426098.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/86935130239.pdfIn PDF document text
    • http://etasystem.net./userfiles/files/fubejulegagi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cc720048f---mubojosuloxoritor.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/zibawaj.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8gqfbi7hu4g33cmerikiqst635/ropanafomum.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/49530879477.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxisizi.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-02/7c48d8612a75f88154f000800e2cba86.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fenaremejaranomudurur.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/59705044342.pdfIn PDF document text
    • http://pi-consulting.ch/download/kisafenotixasarikeruwun.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8243ab0d---29373489819.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/31eee1c5ef317c26500012c5f91911c5/levegi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bf191b07b---34213491242.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/fosuvokunugila.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0899281aa---46124790403.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/47909615052.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/giwoxifesekanixel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gastritis+erosiva+cronica+pdfPDF 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_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10672 bytes
SHA-256: 69aca588ad123e27522983f9ab4e5b4692415e58a438b6d197c884db1f7d4577
font_02_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 17092 bytes
SHA-256: fd5734284bbcfc9b83f33995e65a665fc700c96ddf8385139fde40c11994d795

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