Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c01f3a23ac662a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8105b03efb8751791cedd6c34f4f7d5 SHA-1: 3ccc2f9b31d768322d67b50fcc9db38f9290c93c SHA-256: 39c01f3a23ac662a911086a930e530f8dab67c30014a072b6ad06dfcdf0b9ad0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm nature align with techniques used for initial access via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://klimatyzacjaradom.pl/userfiles/file/6829810281.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b0fffad519ad68073be62163b023ec97/7147021255.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/suzupokerapejatejosarox.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/boxizew.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/29666855177.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nedodosol.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/99315739774.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6595602199.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/74948128646.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/puwabupaxiwiw.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/nifezefinujisuz.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/jusexexotevira.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/97740591793.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c9a72137---37036222226.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/iqntnt2es7uem9supur4odkd82/86245190743.pdfIn PDF document text
    • http://webs123.com/userfiles/file/refamapufefewuruwox.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/kolidusekej.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/30277812993.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/kuturutikaj.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/dofomufegul.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/436e2e3807723871274c0ba94dd694d0/95690163219.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/bekutalirujupoduzam.pdfIn PDF document text
    • https://bamor.org/userfiles/file/34303616990.pdfIn PDF document text
    • https://beaszemin.com/files/puruleto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ovid+ocimf+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_off0000bf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 17252 bytes
SHA-256: 3494da526121e6f5866925207b21235d78f225e226946984b1953c055c6659ca
font_01_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 10060 bytes
SHA-256: 832860e3ae012ce35bce249aa9650ae0fbe7f504b9cf3094effac452e7a03b25
font_02_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1