Malicious PDF — malware analysis report

Static analysis result for SHA-256 640aa2397980920a…

MALICIOUS

PDF

96.6 KB Created: 2021-06-29 15:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 05d7d8cb3d90109c14365edc8c816fed SHA-1: 23d1b278f9bcdd25dce230b338439098837e670a SHA-256: 640aa2397980920a5e7bf569be682f72c014af9fc853410cd0af29bec6c80c5b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates that the PDF links to compromised CMS upload storage, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9mo667a3265laldn19l0nbahjc/49101948608.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cbd8b95a---54883745178.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/psfio0ou5mpmf75nbicmfqq620/fapexexidezolejivifobizu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/14247514045.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/69625969400.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/13422785025.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51ccd51a0---gojefaxe.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/383444aac87c5f3c8024360585904953/23136144826.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6118160ea0---vamilolajilawofifulevigi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5034fb4f4eeeb765cac4ac4484bd74cc/35927920720.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddb61d7338c02bc96b71093770baf1bb/6475298243.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/42036809037.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/surom.pdfIn PDF document text
    • https://mmszke.hu/files/file/rubewezoxituxedapule.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9519ef44d744bd42ec604b4ced7e9973/64794767740.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d347f047---773149006.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2cbe25270---sugapogem.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2284a1de---suboveromesigiku.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/89368533778.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b6d8eb58---vejupo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72da1378ce---20079115907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dome+type+biogas+plantPDF 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_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 17540 bytes
SHA-256: 988d8503ba732e29ea84a547fda9758d901552fa3f79e851737ec647fd4aa20d
font_01_sfnt_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 10752 bytes
SHA-256: 4db0ec06a3f6d594ff4ef790a18b46d508c6576b88bae95fe770629dba973f18
font_02_sfnt_off00015d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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