Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5551f40b4fee651…

MALICIOUS

PDF

84.7 KB Created: 2021-07-05 05:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 39d12b8679cb0fcc3811f38f7eb39c7c SHA-1: 02d6cb73de49b3b25f125d8d7ac497aaa0078600 SHA-256: e5551f40b4fee651df614be5e3f745d59d4a8d098c02e06739ad4c766e49b07d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These sites, in turn, host or redirect to further PDF files, suggesting a multi-stage redirection or phishing campaign. The use of compromised CMS upload storage and disposable hosting for link farms points to an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=canadian+dividend+aristocrats PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/86ada3cf72939c339860a44c6a1e3091/31057770099.pdfIn PDF document text
    • https://kristinanamaste.eu/files/99841948079.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a810n1v965gpaft6gedikgjmnt/62182062977.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/57f5ffe6ea710e25fa181cd206aeceb4/tutemex.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/78664118795.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/11cebc57369e5c76779e13d7f8c055b0/80891913590.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd7368b2c---pexonisopakofa.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/5385774401.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160829382083da---97410280012.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/10002334953.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a570a52202---39312868658.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083941de42d3---28530759274.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d281a21542---busejowur.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ockptdonc005c5eqi0mvhli8rq/97304537258.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/50933464128.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/99437121663.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-3/20210603190309898585.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/pufakewefotu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fumibe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/83d7fa0589210700cf60bb34d1ea32cf/puvasewitixowogajowena.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072751c8659c---saguzigetaxo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd513cd499f---17398494837.pdfIn PDF document text
    • 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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10416 bytes
SHA-256: f7faa8961a2f2ea1ee9155425fcedeb7092872e25bdf67b7364994bcf8a61973
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 17460 bytes
SHA-256: 2e3da80ff0614c74f72c72eb6736c3698bef43111eef5c8c0c4086e850c2bc20

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