Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35fc1cf1387ec9a…

MALICIOUS

PDF

98.9 KB Created: 2021-07-03 13:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ad0320ff1765b9ae90abf807369bc68 SHA-1: 76d6b3daf1d7ecb513e3e81698bd01adc504d010 SHA-256: c35fc1cf1387ec9a7749b43bd20a3abd713df4a6207153194789d5d3e6e41a94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the links indicate an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://aduanaldelvalle.com/userfiles/file/38842518676.pdf In PDF document text
    • https://newtech-utm.pl/userfiles/file/mozewilinalozuv.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b0e2235b---96850548936.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/88398017577.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/89455108915.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/5567163184.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f331845bb5---92079648493.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///minom.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85fd4813a---84946197636.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a0d4c6b45f6bd58190b24ed2b80249cf/narutekaridomedakud.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/64673602567.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f22d3bace---jusubarusu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9de459a0a80f5953cc070d74e8c6b995/62903866584.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/74de6e4cacfa4f1837e67a5f98f503b0/lekanebiripoguba.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tobuk.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bewijobesopapapa.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ecb56bdb---90590350206.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/sonubanedi.pdfIn PDF document text
    • http://mopron.ru/upload/files/xasowa.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/58384279422.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc989a4d69b---97231966757.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c5e1d96c94d8fa7e7ec2ae284b0a6f24/jewajurafozozudisuk.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c155735895d---mogalozijefelopezemifok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=example+of+endothermic+reaction+in+everyday+lifePDF 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_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 17996 bytes
SHA-256: d4855a6e5f80c773186b4103becbf0a8df58e08b5934bcae72843ae94793db37
font_01_sfnt_off00014cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CA 10984 bytes
SHA-256: 87d6e6c5eb8fab29b8e0f5ace0799e13cd27aabb7fd0a6af36a3fc309720da04

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