Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae7ea675804cdea…

MALICIOUS

PDF

120.9 KB Created: 2021-09-03 18:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d38b361a6f94842be1fef6818bf833b6 SHA-1: 3d4141b698c7fe68fa38c0787d5b1491328d03c7 SHA-256: eae7ea675804cdeaf30ed889b88b3be374f44590603207b54d452d499ee6f8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vietnaminsight.biz/ckfinder/userfiles/files/41668866141.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f19qbe730maajieiq3un4tvck8/20677509269.pdfIn PDF document text
    • http://alkanboya.com/files/file///81574957833.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/pasaposejojive.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624686735.pdfIn PDF document text
    • http://coffee33.ru/archive/file/45446371346.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1d2bee740f36749380345dd0baca3829/kezafomuzavopasik.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0a7402f2a771a5b5de96046df8eaba16/56359985547.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16125539a0d4fc---wudafazevufumarolitodoj.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/67529697211.pdfIn PDF document text
    • https://migger.dk/userimages/file/10797642129.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gufutipojakozepomeduzet.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/85552686762.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2895c3a95---66596844261.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d611d4229---53521528532.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0590a94e6f---pekibulekiwuxesebilojubeg.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d991599a7a---vozageke.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a74936a2---8205605968.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/5428830867.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/dijogedojirabumo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a7e04d001---nelofizokuneselilimefo.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d1ee3f1d42b7ad99c5ab2b0dd39bb39a/66486283485.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f135022bbb880a8a20648badb27a5f77/kisakusidetox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=oracle+enterprise+manager+12c+administration+cookbook+pdf+free+downloadPDF 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_off00016c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C68 11476 bytes
SHA-256: ed8015b8c0db414815e5cddaa75aa3e9d6926208be862422368d4828deb9462e
font_01_sfnt_off0001874f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1874F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F61 20016 bytes
SHA-256: c217e9ad5bc12e383aa184be0fb851465d00e366e91aa3347257e25409cfed03

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