Malicious PDF — malware analysis report

Static analysis result for SHA-256 551a04e504e9c6fe…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 12:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 203b4b2d1e73a3e9162f3ac04e2c17e2 SHA-1: 2c4cfa5aceccf469f7a09af82fcd954f9d20de00 SHA-256: 551a04e504e9c6fe9072d419c3ba39c9cd008cb789c286db1de2a0808ed10813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d137f8c2b4---62402580163.pdf In PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/22310905918.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/duvoperamumuworupusef.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vfcmvgbjbl8ki5gfah5gpigi32/15618555428.pdfIn PDF document text
    • https://datenglagi.com/contents/files/digiwuxolikuwomawanim.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/76663207454.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/33162813324.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/bajunezisimeselawiguda.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4d2bcd73---62558525363.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5a848275cf7efc41bb5748b6c4e2aa1f/bedolunokekesafe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9vhefl7q86cvlatghhlf4qib2b/39763672260.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/32646945775.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4shrn3nt823r1g6l7a5jb4dc6q/3214197834.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/qtchsn4lniad3j41b20hat2s34/6568416722.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/vebaduzajixaxogotafafi.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/10937255611.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210703001645.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/47135680666.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b97e161d9---sowixanufatat.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/xikanupoz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7ce3f6adb51989bbdffb34809bd3b22d/bobemezukelimurigonebik.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a42dab76c3886d97f9c0f2aa5e560052/98105158717.pdfIn PDF document text
    • http://winso.tw/userfiles/file/relinidovafuxazavifegiret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+monopoly+deal+cartasPDF 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 10788 bytes
SHA-256: 22df1a84833d3d599bb4982f416a816c20178a80928f7d6cf6fad6dd0bf16487
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 19336 bytes
SHA-256: 53f215b33e614e4febfdc5b2d1d24fd05811a2fcbb16e0ffdbffbbfeb89dd830
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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