Malicious PDF — malware analysis report

Static analysis result for SHA-256 e164fa15496b25e5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 04:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 012973a66a24c4b01534adc26540fc12 SHA-1: 29e032fed546a2d5fe0bf0343e389f5c0c7bc4d1 SHA-256: e164fa15496b25e50461b87016b9fbc28e82176d2d95e08f807a6a6c298a3619
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate structure for hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.elmundodelapiscina.com/ckfinder/userfiles/files/nutunegawofij.pdf In PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/48558362130.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/70620060432.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wikiximeditirapibajodasef.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/kudipovitoniwewo.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/gopugeju.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f932068a---15853010742.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9r0ajffh1hkusntft02io8b1pf/woxapasubafelafinav.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/garufumato.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161495c8c81a8b---zitogorowunikid.pdfIn PDF document text
    • http://pay2pay.net/upload/file/gakavejiguna.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfb3e18ca---luzupijipajibivuvazupiwim.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/50199426630.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/pebukomogaxo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161409416e7e17---8910116000.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nr9ephcjnjcgfr4aqil993uhdl/soworuzeruj.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/79889428896.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/nurofumudazumug.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348bad910fe---muxow.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130de671d753---86277565015.pdfIn PDF document text
    • http://deltools.com/userfiles/file/xudepusizumebogogadoruk.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/6060950882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mod+menu+app+apkPDF 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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16484 bytes
SHA-256: 948d6422f18ff5ed12d9385eb78e0b55ede87e95503d721e31372c7f78c411ed
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10236 bytes
SHA-256: aa1fb07824cbf7502b816102b99bb821b8010b36a04768da597b1b99d04a5178

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