Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e7d1a8831b3327…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 07:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 443c41048158222e81d298d4cd1e9852 SHA-1: eb2d2b3247400aa6b83110336a50f438f37fe1e6 SHA-256: 72e7d1a8831b3327c1ef14b5bd360ef17d3cf99146c87c8cec01b0af71b433c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous disposable URLs, a common tactic for phishing or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, possibly for malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=sunshine+live+app+download PDF link annotation
    • http://rungrawin-itt.com/userfiles/files/jurufuketewinobesog.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210906131721.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/juranipujowizudelogupigot.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/xinosetirusexusevog.pdfIn PDF document text
    • http://aven.su/userfiles/file/96394648507.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/66987222430.pdfIn PDF document text
    • http://recrute.fr/files/files/57235729019.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/11674388190.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/35109816996.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/42260964424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4d03ca49---jefuribitatamav.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/52003616183.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/popevivekemudov.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/karitojezax.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/kefogulomugas.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/bumuzakirovoropodaganax.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/42237573272.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8cc82f526ce97707f994f24b1eb26b0a/tadipij.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613409db1d56e---49382122614.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f99d66263---rejapubelorutoninutov.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/sevotopajajufok.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/91511251514.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/49157629278.pdfIn PDF document text
    • https://tepihtrava.rs/files/54178705383.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/tafexoperitusokupiwi.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/fogamorukigunukisuriz.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 18588 bytes
SHA-256: 1945acee4eaa24a10a00a26374dda533e6f030dd9eaf014b133c62f280e6f70c
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10620 bytes
SHA-256: 04befd2c381bb353f77f7f6df3521e1ce9d445660d33a6b58c54d8c4cbdcaa1b
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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