Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb473fadbb7efc7…

MALICIOUS

PDF

78.2 KB Created: 2021-06-25 17:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ead1db20dba48c4c03785a87074b620d SHA-1: 11e18732368f8a69a5ce51e03e70f47e477ad5a4 SHA-256: fdb473fadbb7efc7160cf98a802e74cf890dd08c42eb91b9e410bf60fee96d42
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1433b0b3724929a8b96fa6bf93403809/jilak.pdf
    • http://auxerretv.com/content/public/file/30621915691.pdf
    • http://eiak.org/upload/editor/files/24871325390.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/2cl6k0gml8ujap376fijd48r2s/wewazofag.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/12c5159ce74a260cabe66d28d4c027c6/xosisuduvevagumedizub.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/mojisasuso.pdf
    • http://aelma.com/sites/default/userfiles/file/nelaxazada.pdf
    • http://thevelascofamily.com/clients/11614/File/jojavarogafuvan.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcc3f29b4---wawekawebipebuzukon.pdf
    • http://faradbox.pl/files/file/tevapamafojanuwuvoditu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2874bd47e77a2cdcc54f02c1f7fa91e4/12867041111.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/75546198161.pdf
    • https://1877painters.com/FCKeditor/file/dewufaje.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/32220151449.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56n8kansq5uujgqe222qijtvfb/5466491495.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad436d6a243---83143531453.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kadvnhc5kv3mhqkl70k5cc4845/7235860300.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a0jnmuqkbbio98ggjfaufvnf12/85391318856.pdf
    • http://youngshiny.com/userfiles/file/1622132126.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5df4019dcbb6edd180a52ba98c3c32b9/fadezukusatejo.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/fba17640bd65c5a561f6979583fabf63/74300728197.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a498839fe1771a57e490ec564bbe4165/53537619248.pdf
    • http://beveragesgs.com/userfiles/file/11702446763.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=r+kelly+the+world%27s+greatest+mp3+download
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c509.bin
8a0a5d5e86318d618eef2a46a8672bc345a05d62a1e16333a7e0789864994a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 11288 bytes
font_01_sfnt_off0000df5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 16792 bytes
font_02_sfnt_off0000f771.bin
5a1c1937a6c4eeda41e31e1e1e8d9c7df56d15245453072a6eaf85e99ed192cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 20072 bytes