Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a4bf2118e2bcc1…

MALICIOUS

PDF

88.6 KB Created: 2021-08-11 07:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a4b85fd433251a9086e6c660d5c6728 SHA-1: 537868ad16798bcf2359c9cc21a230a0c004ba18 SHA-256: b6a4bf2118e2bcc1624829b524570d706e7b963f1aae67bf56588292bef8afc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further stages of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06d9e76c5aaad71880c4508057b28087/rutijaxorotedasiwu.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba349ea2c1---29616956164.pdfIn PDF document text
    • http://dakmet.pl/upload/kerumaseb.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/depidol.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bimogakemaga.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nelageb.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/917347948b6c6629265ccbfc58ff60ec/jibesa.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/gomixiji.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8746581c56---tafixiruwavi.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/taxuruz.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/47so79nviq83rj1ama8beb9ms4/33747164303.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/395d74fd5ba7aeacd826def6ed7255a6/58606818864.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66054013169.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28db86f1ba---mujije.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/bedosuvilerotek.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/03/85067285648.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/1pi77t6bkqg69umuc6qb8mk9k1/52710612861.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/latukexexile.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160820e06aafb8---wujawabuzu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/lesaji.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/788ef9a1cdce70c7c71ffd35b921900f/41984881079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kinobody+superhero+bulking+program+reviewPDF 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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 11332 bytes
SHA-256: a0324512ca74b1ddb287593729ff9d8f3155d13e5b2bb72ee969338cfae0b09e
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 17332 bytes
SHA-256: 7b5b109c15782e5c3bdd9ffc53587c2e73653c87d8dbefa57d506a572a10b198

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