Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebed7d5b42aa5b12…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 22:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c4576ddf8d1d39d3a41967f3d2519a55 SHA-1: 54fef3a3dd8f36a005fab32595b4910d6fbe4413 SHA-256: ebed7d5b42aa5b12d629c6f556fc20515b0e42d1d2a850abf5ac1dc69ccececd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/levisires.pdf In PDF document text
    • http://rimini-portal.de/bilderarchiv/file/42765086493.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/88201195649.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382896c4b54---10385772192.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/lejikanujenupulozovarabu.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kixebomomaz.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/kusuderaromejojagomolefo.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/25720686957.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0dc2f1721e35c798fdd1fd017e68857b/buzokuganogobarixu.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/81854703253.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/luxagojagaminewazi.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/90744251475.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/laramusofosesab.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/zidivuzed.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6cad66492258d26f4d182da076f2812d/dexogididova.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wuronabupirutaxemije.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/56963693499.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/14821278321.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/74152766618.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/25918359540.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/mamevafawapob.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xavufopowuwuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=install+virtualbox+on+androidPDF 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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 14560 bytes
SHA-256: a740403c8a1abbcb07a742460981eca81aee08945b2ac68700833b9f93f63aa2
font_01_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 10468 bytes
SHA-256: d29b413fc5080255d4713071718100944158049522f5452e5c03fe61a836d559