Malicious PDF — malware analysis report

Static analysis result for SHA-256 690e6f4a0969f441…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 11:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7aaa3755d1323bfa6de248e2d543e981 SHA-1: 27ed2c21cb2cde865729664c96c3bbf5f68da938 SHA-256: 690e6f4a0969f441735ef384729e74c180e52078723eaf7cae92980f4a3ae7ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sabresources.com/FCKuploads/file/lorenizudenosazomivet.pdf In PDF document text
    • http://dyweisheng.com/uploadfile/file/2021080303432373499.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f3aca66e---silamikijum.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/zavobegufijel.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/93224653926.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/fedoperevi.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ap9a8t9v0v7m93u9om7gh26g3/fuzuvozikekogobegaru.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c89cb7a84b7---radivobo.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/nuzexesexidaxewejapifalan.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210510083253.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/85826519626.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/240953e1kfitenl75i302vu666/fogavuvejinavoturilop.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/tukewimez.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/19538997556.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/84040208455.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/53174934389.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/51980304202.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pumipovuji.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627280438.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/46065459599.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27972161870.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/3333625034.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/subos.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/texeb.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/126e1f731f28cbe054e562867fcdce74/tizusoviwerek.pdfIn PDF document text
    • https://avenue102.com/uploads/file/21498780500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=microcontrolador+8051+mackenzie+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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 17616 bytes
SHA-256: fd2b181a26537bfffd0e3eea8f1d381a752bf8f29b3b134190bb7c914b5e6bbd
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 11276 bytes
SHA-256: 498920106e11067b281f6a53d595595647cc8b5ab37b21ff744d9ec85512658f
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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