Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a4587b3e99f96e…

MALICIOUS

PDF

92.9 KB Created: 2021-06-29 07:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: add9d16466f6ea89665d573db686bc92 SHA-1: 2cd562b3a785d1860ab2d95fa915404975129a45 SHA-256: 05a4587b3e99f96e986eba382de72798740d803dcf6a5ae6c566b6f73604035a
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site, potentially exploiting vulnerabilities or delivering a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/89e1dde8dccd378ea65e174c1f1d0cc0/wilafaduzovinomaguvipowe.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/66663808891.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a7d9b7907c67fc245ccb1a9a7d03e859/gogiju.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/34502284967.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4cda92e440841dae24b2a741ff3d6bd0/wibenejuwanuxusipuvej.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/fititikusijelizodoguv.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8999e22e8---47802978311.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf7f4892b---fapigikowejanosufopisug.pdfIn PDF document text
    • http://keramann.ru/uploads/files/nepawikojuv.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df8f7ad6a171c7342175daa88ad7f7b5/62572131061.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/84731631390.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/8546341155.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/ruxedeninosakuxixexe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mirov.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/69249464228.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/pq289jei1hdqp2hsdp54on71d3/seporupe.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/aaor29ecjujvgvg6lh2nnao3g0/jesifozonijafamufubiwure.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/82e6118ce14c11f1aee4f283dd3e866b/fipugagimebaxi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4b31efc291bd5f95e4fdba34f92e22f5/33868510810.pdfIn PDF document text
    • http://wirheiraten.de/images/file/80135758662.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/wuletajisugefanu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b198df8f6bc---1076576.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sumekisutiko.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb42ed7ee9---bunapotabeburitan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+take+photos+for+marriage+proposalPDF 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_off0001073b.bin
aa12af13dd1045057872df1b35b3405f98c03401e98f3f1a7ee34427d93dfe69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 10872 bytes
font_01_sfnt_off0001206c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
font_02_sfnt_off0001387e.bin
6917713c92ac03c9a545b22b43d4c605697a5da3a65d381c3eab60a83ddac3f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 16956 bytes