Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa53fbb491a4403…

MALICIOUS

PDF

72.0 KB Created: 2021-06-10 00:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a43a7a94cb69cc33c12c49ca5db6a5c2 SHA-1: 98ed8e6d0b5a5b805aceca2a79f3babf60a1df04 SHA-256: baa53fbb491a4403952ead08cbe9aa55fb4d1be9cecd98fdce1f4979adc02ce6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=harry+potter+ultra+hd+wallpapers, are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://nomylo.ru/uplcv?utm_term=harry+potter+ultra+hd+wallpapers
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9625af3003---72462354652.pdf
    • http://zzliuxue.com/upfile/file/%5C/jotedibiguragopefum.pdf
    • http://samuiluxurytravel.com/Uploads/file/34527520258.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa80898e1---pifazafo.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/c481g8tdt86hpclimqp5e27li3/rovejoborigojog.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f61dc05b7---69174590370.pdf
    • http://cuacuontoanthang.com/media/file/kejexu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92f43708d---65672848072.pdf
    • http://amandatravel.com/userfiles/file/3019431297.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160877d5cdd482---96566181137.pdf
    • http://chinajnbt.com/images/upload/File/79515963553.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jf2i3vfl4sdu8t11bc5s02llb5/jubetitubijuzitogub.pdf
    • http://vds-construct.pl/userfiles/file/69541080370.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785931ca7e5---purivalakavomivoxe.pdf
    • http://accessprecision.com/userfiles/file/fepekifogokenutukowuviz.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5221c773---37580620682.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac373735e---kelifuzes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc21.bin
4b4e1813533a5a0ff83c2010756f3727630330a96b03063da5dd561e530aa178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 5200 bytes
font_01_sfnt_off0000eddc.bin
e5a3f4e08a6e0cb09700ce73a99003fc023eccb0b00ef2a1905f9632d0c9de14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 11020 bytes

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