Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5da1c519d93a42…

MALICIOUS

PDF

94.6 KB Created: 2021-09-01 06:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbb3df3bc2254cbe904b20782f6011a8 SHA-1: 807c13aefddb14173a6ce2a1dd807dd70c231465 SHA-256: 5b5da1c519d93a42ad24f8bc4f67f218f597d9d99601c2ddb49b322bb8536c2d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent rather than legitimate document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb68397fb4---19100062147.pdf In PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/botumajabonebuji.pdfIn PDF document text
    • https://wrd13.com/force/file/ruzelazoxupanij.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/73373065618.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/tafute.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/1629684622.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kiwovelosefu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mowiniwuxe.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/gudupiduwowuno.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/77575461533.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f163cee3---kazorugo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/63960625286.pdfIn PDF document text
    • https://x-software.cz/data/file/wovomosupililodetanamofu.pdfIn PDF document text
    • https://eventaipei.com/upload/files/69659889831.pdfIn PDF document text
    • https://go2germany.ru/files/file/febolasuzupenaxupujosugo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3881ffa4---79679772301.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff3f97975---52154490182.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0408ddcd6---90931188587.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebded2e621cdc14dbc4534fb70cdfa6e/46609972055.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f53593fa87dd2f0d465ecc9ce91de675/44350772491.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0990671001624821508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=man+is+free+but+everywhere+in+chainsPDF 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_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 20092 bytes
SHA-256: 360008f8201971014b19e9594b585520cea149a01640ec5f7395a732cda6dc8c
font_02_sfnt_off000152f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F3 10768 bytes
SHA-256: ce79f7d9ceebba29da66de5cef0612be7620b8ff54f1fae9d3e0846c05aee8af

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