Malicious PDF — malware analysis report

Static analysis result for SHA-256 acececef2f3c93ca…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 23:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b48963d001684718b02934ad879af483 SHA-1: 8d06a654ef89611f11f5dbd8591fcd1d5b6af8ab SHA-256: acececef2f3c93cab6521c800ee627cb2252bced39f1eb9741fe973328dd8612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple links on potentially compromised sites suggests an attempt to distribute malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://asbu.net/uploads/FCK_files/file/wuvijigigegafazoxo.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/80917e08b1e69230a8d89a3a2e821036/41429377115.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7r5or321dq83uh1cgaarcg6884/64080566901.pdfIn PDF document text
    • http://deauville.ru/files/file/jifovokob.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/77557368930.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/pavepanebovuzigezi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70f85b894---67997503352.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fopamaxijixofesifasedidap.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/tivune.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b5cdb660579a07da76d49839501194fd/zapetidaxiwaki.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8e1cceb9---56320518604.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e371764b8---repiwiwigisiwetivu.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/19554988394.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fvia1glu824b2c3pmjt64de2k9/dilupijosijixe.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/giwitupomuf.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/47734857104.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/redesesa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078db8f40b37---59987891800.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/kujojibosonanibojor.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ga1kr0hcrom8hlbh60nd4pf66g/purepijeluzewojitiveralip.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/88244143929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sabrina+1954+assistir+filme+online+dubladoPDF 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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 20056 bytes
SHA-256: 11c07ba534cc10138183daf75e35f867a70048a026f0a2fd57ea9008bbf6fb9e
font_01_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 11260 bytes
SHA-256: eaf0b49d7e979b7393d34a40d76478264a377bacc583c8a3662242305d17afe7

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