Malicious PDF — malware analysis report

Static analysis result for SHA-256 9555ce1d49a8af25…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 00:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32a06ac81a99394ce8c603e1e8463d03 SHA-1: c0f75de1b639f8f3e2477a09f3e5bfaae75e751d SHA-256: 9555ce1d49a8af25a70c62dee733d8b7fd8e1b51741fbd0f361a2d26d2a2152d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple link farms and compromised hosting suggests an attempt to obscure the ultimate destination or leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gorsilawfirm.com/userfiles/file/siletazezox.pdf In PDF document text
    • https://arendic.cl/files/pisekosazugurosuz.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/97581531141.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/148a48aa95b8f5ca73d94f691b25a96e/bubunejetukaju.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/runigamixojulebawe.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/81455420323.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210901165540.pdfIn PDF document text
    • https://keongracun.org/contents/files/35112758459.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84291888281.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/ruvapezineku.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0ee18e5ec3f52a0beee51b3822ab9880/funoze.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090116332862.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130420047ec1---18627509083.pdfIn PDF document text
    • https://hssanesteban.cl/files/98937694067.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/bavixovinuxigup.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/vatiz.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/72957135297.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929a03a3b9---33422136318.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/kebapubulaz.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/30660249383.pdfIn PDF document text
    • http://atya.eu/files/file/logano.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/37070906066.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/92228190824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mini+militia+mod+apk+latest+version+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d201dfae---dupejoki.pdfIn PDF document text
    • 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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 10792 bytes
SHA-256: aab4180394a6333601340feada40dc22f06a16ee3e3681a155189828e7fb3233
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 18672 bytes
SHA-256: 7fe76ffc5cf9baa9a2271334b852904d1689fc09bf214fa01f325f8f6898cd5c