Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6b7901159aa181…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 12:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f6fd9bea3d22d118c8bc05611387412 SHA-1: e382b96f1868a5f207f34d60abda70f127a40f08 SHA-256: ee6b7901159aa1817a857f8380fb49309be874ed156a9f1fee8e8e067165f447
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to domains identified as compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of PDF-specific heuristics suggest it may leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studioagronomoserragiotto.eu/userfiles/files/42126803661.pdf In PDF document text
    • http://studioguatta.it/userfiles/files/29759183528.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4cd22dc5---zomezolikabun.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/20445275783.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/1956430518.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/pekatoxidulalugowel.pdfIn PDF document text
    • http://liyangah.com/Upload/file/89264497735.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300e10be72---55562390570.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/59480609256.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8ae20318---91439117057.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cc01c1d68202fb447a3e7bb6bcc52f0c/62994055870.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/15160448155.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/koxog.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/be74e2f3ea75c7344e66d526c76da963/dilemezomurajuge.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/kagarawaguf.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/k2k8gik83p4kpdcunsj827mg70/17235274404.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7ddba5885---18858679269.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/lozitekabomoxejowida.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfff8b5df6---61690313385.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/81454372857.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sagofalenebipikevunadados.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061720505595.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a2c33e9f---fujefuvigido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=geologic+time+scale+worksheet+high+schoolPDF 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_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 16500 bytes
SHA-256: 97681e7b6b42f247180c675e8878aaeb89b6c0667bcbd9d1025d2355bfdbb465
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10788 bytes
SHA-256: 184a80df5718b25329200e4a74615d165f273df53ee036156b6f9ac5353727e5
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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