Malicious PDF — malware analysis report

Static analysis result for SHA-256 519e9095512369cc…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 06:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e5a527e10d4e10efc84efa56a5baa1f SHA-1: 0e26e4302f9f1b14b03d7a49cb0895ca5c96dfd5 SHA-256: 519e9095512369cc85ead69ae5c20fc9145f788d913eb9a8d29f23d1288b87f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://yjsyrj.com/userfiles/file/36883348798.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/db183325342d6daa01f5a2a2a3b7f57d/74903076426.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c4fdd4351e26cd35dd3eac12a1c93824/xigadutenupotovifagizu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vuxala.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7fd1b89f9951983c625a8a6e1aee3bba/46551264390.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/94cb1fe5175a17846de7a8444e48d9a1/54901045978.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76lcg6m284k9ae11cvb6absoq3/somulunogosubinitov.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/00d22bf02cd42abe36738d020a666d69/josokaxopezovorupiki.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1491502fe8---14096880340.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/ludiwapuvubefotukerex.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/21408565304.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5jsfv7c786km4v6sesufqaua93/tuzanowuwufiwekoja.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb119aafe---57946474683.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d70c2e803---babasax.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/13506157607.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/34860701934.pdfIn PDF document text
    • http://flexa.cz/docs/file/misorejivixibuw.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zawiwowovonuwiz.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210530040126.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3633a6321d---81871607179.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9914a7b1311e4edf7ada8ab99db8273b/92980239416.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/10114673315.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/zewozubonaronimorat.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f7f33f74---49279514439.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/88051415959.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210628031731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=syllable+lesson+plan+for+kindergartenPDF 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_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16816 bytes
SHA-256: 2b1f2efa1c4ad769b9eb17c52317b6dbb4948bd86047e1c18e9b754114d0b11e
font_01_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 11092 bytes
SHA-256: edddbb3f2937ed818dff21ff974e93b1a4ae597b4ef3f6cb3a71177d5991b612
font_02_sfnt_off0001439c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1