Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9423f99c582f21d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 01:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8b9ed26feb7c22e7afc8337d423fd01 SHA-1: 512d0d3d98f0cc047016dbc8619e29a65f32af15 SHA-256: b9423f99c582f21db620aacccf04e26a4955fc170370071727de4fd0c7959eb5
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/t0ahru2ous9bpqe7pts5ovbnu1/27839468176.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2045a564c6f55f743b7a48e432aa2db1/retaxeketitefi.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/11959363629.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/84204611974.pdfIn PDF document text
    • https://combrooncom.com/contents/files/duserakuvejibuj.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/22310280731.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c174fcc1893---87772319188.pdfIn PDF document text
    • https://abss.pt/userfiles/file/27338837158.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/54595006742.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaf81adbf---mikiregexesozot.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/42637632147.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/vigaxaxatuboxelesejovobal.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/tutowideguredezojupatari.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608798a2affb3---nolekubawulas.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/juxofabesoruxelew.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2b7f3288---31440995209.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/41487045726.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dbc601f4---linavakovuraxobib.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2666b0cdad---lasegiduredaro.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/eb15646c918da96e81b025a58f8dbfc8/63185546871.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/911fae5c28eb4064c399a788a7fd19ef/kobulutulerab.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ce35a02b64252668bc83254cb124377d/12604366389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=electrical+installation+technology+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_off0000c30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 15636 bytes
SHA-256: 68ec33f8dd80a5bff2c3bab43e47f0cb21398210ab047d076298f5a4143ac26f
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 10996 bytes
SHA-256: 91b285f24d4f8691e4c1f2432ec29ac53a018918e79d23a4878b8b99c9002107
font_02_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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