Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97e5571f5f6e976…

MALICIOUS

PDF

98.5 KB Created: 2021-07-13 04:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4864911bc76e6c5ef55d4f24037c3786 SHA-1: b5c66b61b061dce24101ada6b6457d12818d606a SHA-256: e97e5571f5f6e976d764fffe813469fd986a133bc909d24020a1a6c9a8991f54
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, indicated by a high number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs imply an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=longman+communication+3000+with+meaning PDF link annotation
    • http://cga82.com/admin/File/zuvafasitadis.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/wepibanipopomejovugisado.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6863d39b---94209542256.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0f41daa7---musadomanininet.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/50441663584.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/792870313.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d347ddad04---panivimitas.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac2eae3c3---zukuwezolefafakakujexor.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd98d18d83---fajudosepom.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/1428850894.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/zevupilatuvuzusigoda.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e03527edaeb---wexugupolidewowojukelef.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/10797554704.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/jujug.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/70470543442.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284c0c42a8---goluzu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/835ja3mcsf0scje2dcl67pfrt3/63646651164.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6cd832445---59209985871.pdfIn PDF document text
    • http://proxima-design.cz/files/file/bejogo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/28661948541.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/85736889884.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7196729004---zusoxabena.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210607071531_kc8gnk.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/fezumovusa.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/30387264018.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ccec9b24---wiloza.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 7812 bytes
SHA-256: 6a09c0c96b1376baa4f4bb168c5e329ff797e5a97d399bc7c8c6ba49fd88c74e
font_01_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 17384 bytes
SHA-256: d6eb33a885ded10b8165c907bb538272417ef09198ff001ea076411c3fcb89d2
font_02_sfnt_off0001359a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB1 10800 bytes
SHA-256: d768d1cd8aa01cee2ef0231956643f5c3fcc1ffa186b7984f5c69284c65016f8
font_04_sfnt_off00016684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16684 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825