Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe87572b49ba2972…

MALICIOUS

PDF

91.2 KB Created: 2021-09-06 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1411d5046b93e42dce324471505225a4 SHA-1: 2eafc5580cf2361ca379681871056c543860dc4e SHA-256: fe87572b49ba29721bf20e24ec0903ea991d5e7ef78565b988b179cd374f7b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload directories. These links likely serve as a distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a0b94cd---76436651947.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be17b6335d---vosuposafavi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/xovebajidewarobutupedit.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c085a7d9a2a---dolezalumevijar.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759bfdda2c6---milixowidipivun.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d65a9ba41af610813400b331dd0464ac/421002356.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/82096420373.pdfIn PDF document text
    • http://yuha.be/_files/file/84039825161.pdfIn PDF document text
    • http://svx.su/ffile/file/22678671526.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/jisolepapef.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108020422589769.pdfIn PDF document text
    • https://tomas-music.com/contents//files/34295650378.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/lijobotenokapifimoxa.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/80546276118.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607208a74a4a7---63589864911.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/92204797776.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87cb57c4d8---24543945982.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210821075121938523cug5a.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d42b359c1d896bd971365035a79ca215/kasararor.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/wisosokidad.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/34137600754.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/vezotoxebeboxifu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161236d6f5c792---kutixorakezusepufuwotad.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/7913436732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=noam+chomsky+linguistics+books+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_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 18428 bytes
SHA-256: f5cb770ba87cb2e4e9186a2fa26e97ebcb16484b7520fb80a6822e94af944d1b
font_01_sfnt_off00012ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 11256 bytes
SHA-256: 7788c07014fd77289d426154bf1558b3aacad9717ae01b09123220c4f2d76654
font_02_sfnt_off00014681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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