Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ba154bbf409178…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 10:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3705f9ad5a3ddac4f9669a6a6f7d9c8a SHA-1: feb66371b1e75abca76cc27db6a7eb1d9c413e25 SHA-256: 90ba154bbf40917859d5dbf3519b0e10cd6e4d45b576e0c88d2e9b8129484e13
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The presence of a callback phishing lure suggests the ultimate goal is likely credential harvesting or social engineering. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/1e4b681400c2676caedb350a8d783a3e/45349471121.pdf In PDF document text
    • http://lamorenj.com/userfiles/files/8467960143.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/nefiwuwabuziweke.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/28695557667.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/wesagetoxu.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/bedonefuxiw.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d140641c---70141048889.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/32996648004.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5443c79788860cef0fd8c6165cbb7e22/87105539437.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2e849c8b60c45e6dcd3fa7cd45519ea6/kimefisalaf.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/34475366821.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/zefanepivozunolagenid.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbda8928bb---82675357748.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/snv641n1d84fu7k9hepmkf04sl/dazezabanafomosu.pdfIn PDF document text
    • http://aa-nusd.jp/tanipiwumiguluturod.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/sonubamulotaxok.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/397072486006bcecf08150c02a1aa2a5/xosago.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/81e71401224c0f779177d9f623fa9a00/98591689231.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94833bfe4a---towox.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/srahn3e9vs81nqp0l3nc154kai/zoxubuvuvun.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/25866766882.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/mivajokivitirudoturiza.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8949a8305---34953745.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/daragem.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef6532431---98384507949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=charlotte+county+utilitiesPDF 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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 17700 bytes
SHA-256: cc4a6c814115d198c6cf68410cda853c1488839ecc15a0eb0f0c7d5e69537061
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10572 bytes
SHA-256: 7b871b3cbfc19493f26acea36e20c4c02427f0a85fcc204ceb2a8c88f9eabf7e
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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