Malicious PDF — malware analysis report

Static analysis result for SHA-256 4956cb5790226bf2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a663e43328b1a98eb19a568e734eb5e SHA-1: 30d2f2291d8a14c5a0da29213d7eeaa6c5323c64 SHA-256: 4956cb5790226bf2fa62ef2dc33e1e55f7d39b0a8527d58f5eccc6f3b62421e4
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://coretry.ru/uplcv?utm_term=discrete+structure+by+dc+agarwal+pdf PDF link annotation
    • http://islenapuntos.com/campannas/file/mexinifuxizu.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/moxamejeviliriliwogidoxal.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/95912763036.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/9458437583.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/ruwete.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614520894ad8e---30881945665.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd1f43074---54040175210.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xelelimum.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613114a900eeb---28270098408.pdfIn PDF document text
    • https://adikkedua.com/contents/files/sivisufopivisuboko.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zurame.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/pelinojoga.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/dosokoxebasozobivivo.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/zibigatinakukaseteze.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/75076253535.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92157976898.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/91755051812.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/35578491481.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dawojobugiduxesojep.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tapotexuka.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2e7eb665---xewovugixago.pdfIn PDF document text
    • http://ndt-ultratech.com/files/85521843557.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/61805830226.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/zexafezomufadunevodog.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/deritisiju.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/foteput.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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 17928 bytes
SHA-256: 162decf2321a1ffbc7486deb589dfd9c04cd2be4317ef0ffdb028842c72e22bb
font_01_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 11012 bytes
SHA-256: cc7fa9b2fcc4c42e8341e34c784e3755e17f0aa7e4d03d921f652794e4fa395d

Open this report in the interactive analyzer, or submit your own file for analysis.