Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b68b17e43d817f8…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 18:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69a5c3d65c8a68b7fb09d2c32c6e3d26 SHA-1: c8b5d1ab17e50bf3ae365eb745fe2d85ba91317d SHA-256: 6b68b17e43d817f8bbb6628f34cb57dfe7b31c774b7eb3ce595d22e61d476f10
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://betentour.com/sites/default/files/file/67884759420.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/53344684121.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095282853f6d---fawuxinumasufut.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fa72772b14762d7c59ba438d7a1f1265/3263104745.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/7878564184.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cf1da137---24527853568.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16088de38f2c74---nijakakupajixetavidixezo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1n3vtpe19cubmrdqu3robcche3/21176449147.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/97ef394e3e66da38acd00bcf849966ee/75824561538.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/gesigegipi.pdfIn PDF document text
    • https://fallsplat.se/file/52810707883.pdfIn PDF document text
    • http://liyangah.com/Upload/file/zamikorisawaxapiwofubux.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fugerupuverimo.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/tixezibogusolazakaburipi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/15933150909.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5c1bf8714138caa05578481245849c58/kajolonezexa.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/98461095808.pdfIn PDF document text
    • https://sinarwaja.com/account/files/suvapudobapadegab.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ae2ceae---majegakadofeb.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/007b05f38ef8b37f00246e2c8b039b97/98749224891.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/a8ig6jhkgu66sqcjq7d6dn0s35/43628882711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tracy+kidder+mountains+beyond+mountains+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/jobove.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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16308 bytes
SHA-256: a2a0c82a8a962c6d4cd880dd3ad356015471ec5350091b2250ee9c1d6f4f9624
font_02_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 11144 bytes
SHA-256: 9cc288efc3b4435f844789c2fec04065e4a0cad96ec6595a5609d4bd74b79193

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