Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb9cc512a04684a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-06 16:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48196fbb992a5a00c1190454e2086b51 SHA-1: 31792119dce73ea2a594ffa92c450c07876faabd SHA-256: fbb9cc512a04684a3c307914b8405cd4ccf3c8d1adcf3dc4336dff94e5b086ab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or distribute further malware. The presence of external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033f78c080---82538940486.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6be1eaa7828afc2d36bf2c9542099c28/37818245898.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/neniwesadodovoxe.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb92c424df---gubusater.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/35bd777a296f3b753f9eddfb492a8f62/zinusomuxuvefaripunu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/si5vei65j25a4dubvsicab77r3/98075537568.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bb3ef4c1f27eb79135519c53207c41a7/31737437237.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/68559275698.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/lobarulefufo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kizadakukowesifiluxoten.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20f61eb19---40672901469.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/17764959037.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/raxipedusivedidakode.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lojidiwasirinub.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/livodizuxiginosapazaji.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/omsnflsfeh7gvjjeh3t4j4qnhn/68766006420.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/72025547482.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609730dea897f---vazowapurexiwa.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/726c611c0f8b01ce3707c9fc688e97ac/90800164621.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/89480018895.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608938f8a2c35---83533231322.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/61657258243.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/28183963445.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wanogaderugenamot.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d1da3d3dd7715a0c020c91b12af66d42/88326438001.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/du3hhoo1mth94gh478icdb0h2h/52484566312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+grow+succulents+in+waterPDF 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_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 17292 bytes
SHA-256: 2b7a8c8f6222154280fb652bc63056ff8e4c0c8e4147082e291cb5af17ffcd40
font_01_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 10736 bytes
SHA-256: 17305ab54654bee9498b9bc01e7bfd8796c4d8bdcd926a0d286afc097f216a96

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