Malicious PDF — malware analysis report

Static analysis result for SHA-256 89854cdcdf0bf39a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 13:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90d583cdc3dbe0d16666093cdceb4799 SHA-1: f3c835b6bc70509eb13391fe5ec1396743476f8d SHA-256: 89854cdcdf0bf39aa72791b28c20424edb7d6183bad0c655a13ef542e29df4cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or host phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ewt.cz/res/file/nolunum.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1966a5576---zidexeboravojazomilaz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fba6c77a7e0---kanenotaferod.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/vuminusefozojo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/m4jnjo3kqa6t5p3nc9dlahdv4p/nagogejubaxuvejuno.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/6304938415.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/penafokepedifotukiwoleve.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/86773463812.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sfsjqit2fsetdse3rlv2vvg0tu/32870059451.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/lorapasemugapedilojegenaj.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/76942809983.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/96470704679.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8689f261ffd712c570cab8968a4a0e10/biredoje.pdfIn PDF document text
    • https://cristalensi.com/public/File/93732152923.pdfIn PDF document text
    • http://olympusflights.com/files/files/lojaligomawu.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/todavibetazoziwatu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62e73ba5e6---fedurijepinuwenuwixutegu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wisajewalasogig.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3b5dc80874f1e93db84155cbbe3d8256/84299717581.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/dezonufavojamanisida.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/89447276368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rondo+capriccioso+mendelssohn+sheet+music+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_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 17532 bytes
SHA-256: 1062f8f79b1573ae4eaeacdde55c259244a0c6c46426348aeb69e28dc9a87ef7
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 11028 bytes
SHA-256: c02a4af9493bb1cd2c0a06151c8374a0cedf06a17502fb7f268efddc4c844df1
font_02_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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