Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b114f5fcccd642…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 07:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3ac5cb16e991da2816bbef778b15b3a SHA-1: b2b65fc2a1758a0aa2826decd217be84effad225 SHA-256: 63b114f5fcccd64282af8bf2e55cd5ab1884b4698d5e1e2d3fe8391c3195acca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF link farm rules suggests a deliberate attempt to obscure the final destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://miyozenemeryville.com/uploads/files/bimonibagesofezuvej.pdf In PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vurefojuzugegu.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b47a8a9c0---watazatonujij.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/7844389184.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/99333017568.pdfIn PDF document text
    • http://come2menorca.com/images/file/jidadagokupulo.pdfIn PDF document text
    • http://keramann.ru/uploads/files/vitezinunakutinuvoxeg.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108212243504767.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c370c69d2fa---fetelogak.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609853b0d721d---vitiruxapikufedud.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/77718277130.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/79343634636.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/19690255538.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/20771693933.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/10355098665.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a8c6d267---nubezelanejovuj.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/95716999812.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/67840346058.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/54322191413.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/75274999947.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610664cf35a5f---29114238964.pdfIn PDF document text
    • http://sushi-belovo.ru/files/zeboxemugivupumozamopoke.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/19815896911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=aterosklerosis+jurnal+pdfPDF 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_off0000b9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AF 17788 bytes
SHA-256: 0e89dca9626fa3a5b7e5d153613c106de296fad48847f24c45b185df0aab4ba5
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10796 bytes
SHA-256: a27e9b4b7002530e6cbc042bb63c3365547e3601e7c90fed9888d277fc241972
font_02_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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