Malicious PDF — malware analysis report

Static analysis result for SHA-256 966f0e5bd86439ff…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 18:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab693d5aee84cf308cf4b1028abf656c SHA-1: 2cdf120daf914613ff31a8e75a2f2d86e2163755 SHA-256: 966f0e5bd86439ff9f15b7b564824d0bf4c99306f5b253df74d4f19ccbc0f158
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/fakot.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b9217aba644769f276b78264bb3662f1/xizilurutijamasokowuja.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/roweresedugapu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffabe684a0a---votuxadozodoja.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0f4de58067---wokedi.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/95929891329.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/wazidorarinojakegaxi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bakesuxunegovokanevu.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fuvegugozabafibufi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d90061ebf01---zelakuzateg.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/21929130422.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_4B7A4AB73C951DD2.pdfIn PDF document text
    • https://cncunse.com/d/files/folofudupatawewopifidob.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161213e2c52004---57468576385.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/42786966405.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082563a9f7e7---sesesubogeji.pdfIn PDF document text
    • https://lemanssrl.it/file/tabudi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abea6b5aa63---sofifajuvaketoxe.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/bikovavaxi.pdfIn PDF document text
    • http://eventechsite.com/files/files/pulijelonu.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/5344674503.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/bodekavazigimeruz.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/fawis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=retaining+wall+design+example+aci+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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 18688 bytes
SHA-256: 7ecc8e6e6acea0ed9558e841c1285959074b4ce23f31e089f5455e3d471c3c7c
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 10976 bytes
SHA-256: ca86ffc1f96128a3632a9731737cdd03de7d2559d14fc48009589b93f2227a6b

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